2021 May 29 Breaking Changes Update (#13034)

* Add Per Key functionality for AutoShift (#11536)

* LED Matrix: Reactive effect buffers & advanced indicators (#12588)

* [Keyboard] kint36: switch to sym_eager_pk debouncing (#12626)

* [Keyboard] kint2pp: reduce input latency by ≈10ms (#12625)

* LED Matrix: Split (#12633)

* [CI] Format code according to conventions (#12650)

* feat: infinite timeout for leader key (#6580)

* feat: implement leader_no_timeout logic

* docs(leader_key): infinite leader timeout docs

* Format code according to conventions (#12680)

* Update ADC driver for STM32F1xx, STM32F3xx, STM32F4xx (#12403)

* Fix default ADC_RESOLUTION for ADCv3 (and ADCv4)

Recent ChibiOS update removed ADC_CFGR1_RES_10BIT from the ADCv3 headers
(that macro should not have been there, because ADCv3 has CFGR instead of
CFGR1).  Fix the default value for ADC_RESOLUTION to use ADC_CFGR_RES_10BITS
if it is defined (that name is used for ADCv3 and ADCv4).

* Update ADC docs to match the actually used resolution

ADC driver for ChibiOS actually uses the 10-bit resolution by default
(probably to match AVR); fix the documentation accordingly.  Also add
both ADC_CFGR_RES_10BITS and ADC_CFGR1_RES_10BIT constants (these names
differ according to the ADC implementation in the particular MCU).

* Fix pinToMux() for B12 and B13 on STM32F3xx

Testing on STM32F303CCT6 revealed that the ADC mux values for B12 and
B13 pins were wrong.

* Add support for all possible analog pins on STM32F1xx

Added ADC mux values for pins A0...A7, B0, B1, C0...C5 on STM32F1xx
(they are the same at least for STM32F103x8 and larger F103 devices, and
also F102, F105, F107 families).  Actually tested on STM32F103C8T6
(therefore pins C0...C5 were not tested).

Pins F6...F10, which are present on STM32F103x[C-G] in 144-pin packages,
cannot be supported at the moment, because those pins are connected only
to ADC3, but the ChibiOS ADC driver for STM32F1xx supports only ADC1.

* Add support for all possible analog pins on STM32F4xx

Added ADC mux values for pins A0...A7, B0, B1, C0...C5 and optionally
F3...F10 (if STM32_ADC_USE_ADC3 is enabled).  These mux values are
apparently the same for all F4xx devices, except some smaller devices may
not have ADC3.

Actually tested on STM32F401CCU6, STM32F401CEU6, STM32F411CEU6 (using
various WeAct “Blackpill” boards); only pins A0...A7, B0, B1 were tested.

Pins F3...F10 are inside `#if STM32_ADC_USE_ADC3` because some devices
which don't have ADC3 also don't have the GPIOF port, therefore the code
which refers to Fx pins does not compile.

* Fix STM32F3xx ADC mux table in documentation

The ADC driver documentation had some errors in the mux table for STM32F3xx.
Fix this table to match the datasheet and the actual code (mux settings for
B12 and B13 were also tested on a real STM32F303CCT6 chip).

* Add STM32F1xx ADC pins to the documentation

* Add STM32F4xx ADC pins to the documentation

* Add initial support for tinyuf2 bootloader (when hosted on F411 blackpill) (#12600)

* Add support for jumping to tinyuf2 bootloader. Adds blackpill UF2 example.

* Update flashing.md

* Update chconf.h

* Update config.h

* Update halconf.h

* Update mcuconf.h

* eeprom driver: Refactor where eeprom driver initialisation (and EEPROM emulation initialisation) occurs to make it non-target-specific. (#12671)

* Add support for MCU = STM32F446 (#12619)

* Add support for MCU = STM32F446

* Update platforms/chibios/GENERIC_STM32_F446XE/configs/config.h

* Restore mcuconf.h to the one used by RT-STM32F446RE-NUCLEO64

* stm32f446: update mcuconf.h and board.h for 16MHz operation, with USB enabled, and other peripherals disabled.

* Format code according to conventions (#12682)

* Format code according to conventions (#12687)

* Add STM32L433 and L443 support (#12063)

* initial L433 commit

* change to XC

* fix L433

* disable all peripherals

* update system and peripheral clocks

* 433 change

* use its own board  files

* revert its own board files

* l433 specific change

* fix stm32l432xx define

* remove duplicate #define

* fix bootloader jump

* move to L443xx and add i2c2, spi2, usart3 to mcuconf.h

* move to L443

* move to L443

* fix sdmmc in mcuconf.h

* include STM32L443

* add L443

* Include L443 in compatible microcontrollers

* Include L443 in compatible microcontrollers

* Update config bootloader jump description

* Update ChibiOS define reasoning

* Update quantum/mcu_selection.mk

* fix git conflict

* Updated Function96 with V2 files and removed chconf.h and halconf.h (#12613)

* Fix bad PR merge for #6580. (#12721)

* Change RGB/LED Matrix to use a simple define for USB suspend (#12697)

* [CI] Format code according to conventions (#12731)

* Fixing transport's led/rgb matrix suspend state logic (#12770)

* [CI] Format code according to conventions (#12772)

* Fix comment parsing (#12750)

* Added OLED fade out support (#12086)

* fix some references to bin/qmk that slipped in (#12832)

* Resolve a number of warnings in `qmk generate-api` (#12833)

* New command: qmk console (#12828)

* stash poc

* stash

* tidy up implementation

* Tidy up slightly for review

* Tidy up slightly for review

* Bodge environment to make tests pass

* Refactor away from asyncio due to windows issues

* Filter devices

* align vid/pid printing

* Add hidapi to the installers

* start preparing for multiple hid_listeners

* udev rules for hid_listen

* refactor to move closer to end state

* very basic implementation of the threaded model

* refactor how vid/pid/index are supplied and parsed

* windows improvements

* read the report directly when usage page isn't available

* add per-device colors, the choice to show names or numbers, and refactor

* add timestamps

* Add support for showing bootloaders

* tweak the color for bootloaders

* Align bootloader disconnect with connect color

* add support for showing all bootloaders

* fix the pyusb check

* tweaks

* fix exception

* hide a stack trace behind -v

* add --no-bootloaders option

* add documentation for qmk console

* Apply suggestions from code review

* pyformat

* clean up and flesh out KNOWN_BOOTLOADERS

* Remove pointless SERIAL_LINK_ENABLE rules (#12846)

* Make Swap Hands use PROGMEM (#12284)

This converts the array that the Swap Hands feature uses to use PROGMEM,
and to read from that array, as such. Since this array never changes at
runtime, there is no reason to keep it in memory. Especially for AVR
boards, as memory is a precious resource.

* Fix another bin/qmk reference (#12856)

* [Keymap] Turn OLED off on suspend in soundmonster keymap (#10419)

* Fixup build errors on `develop` branch. (#12723)

* LED Matrix: Effects! (#12651)

* Fix syntax error when compiling for ARM (#12866)

* Remove KEYMAP and LAYOUT_kc (#12160)

* alias KEYMAP to LAYOUT

* remove KEYMAP and LAYOUT_kc

* Add setup, clone, and env to the list of commands we allow even with broken modules (#12868)

* Rename `point_t` -> `led_point_t` (#12864)

* [Keyboard] updated a vendor name / fixed minor keymap issues (#12881)

* Add missing LED Matrix suspend code to suspend.c (#12878)

* LED Matrix: Documentation (#12685)

* Deprecate `send_unicode_hex_string()` (#12602)

* Fix spelling mistake regarding LED Matrix in split_common. (#12888)

* [Keymap] Fix QWERTY/DVORAK status output for kzar keymap (#12895)

* Use milc.subcommand.config instead of qmk.cli.config (#12915)

* Use milc.subcommand.config instead

* pyformat

* remove the config test

* Add function to allow repeated blinking of one layer (#12237)

* Implement function rgblight_blink_layer_repeat to allow repeated blinking of one layer at a time

* Update doc

* Rework rgblight blinking according to requested change

* optimize storage

* Fixup housekeeping from being invoked twice per loop. (#12933)

* matrix: wait for row signal to go HIGH for every row (#12945)

I noticed this discrepancy (last row of the matrix treated differently than the
others) when optimizing the input latency of my keyboard controller, see also
https://michael.stapelberg.ch/posts/2021-05-08-keyboard-input-latency-qmk-kinesis/

Before this commit, when tuning the delays I noticed ghost key presses when
pressing the F2 key, which is on the last row of the keyboard matrix: the
dead_grave key, which is on the first row of the keyboard matrix, would be
incorrectly detected as pressed.

After this commit, all keyboard matrix rows are interpreted correctly.

I suspect that my setup is more susceptible to this nuance than others because I
use GPIO_INPUT_PIN_DELAY=0 and hence don’t have another delay that might mask
the problem.

* ensure we do not conflict with existing keymap aliases (#12976)

* Add support for up to 4 IS31FL3733 drivers (#12342)

* Convert Encoder callbacks to be boolean functions (#12805)

* [Keyboard] Fix Terrazzo build failure (#12977)

* Do not hard set config in CPTC files (#11864)

* [Keyboard] Corne - Remove legacy revision support (#12226)

* [Keymap] Update to Drashna keymap and user code (based on develop) (#12936)

* Add Full-duplex serial driver for ARM boards (#9842)

* Document LED_MATRIX_FRAMEBUFFER_EFFECTS (#12987)

* Backlight: add defines for default level and breathing state (#12560)

* Add dire message about LUFA mass storage bootloader (#13014)

* [Keyboard] Remove redundant legacy and common headers for crkbd (#13023)

Was causing compiler errors on some systems.

* Fix keyboards/keymaps for boolean encoder callback changes (#12985)

* `backlight.c`: include `eeprom.h` (#13024)

* Add changelog for 2021-05-29 Breaking Changes merge (#12939)

* Add ChangeLog for 2021-05-29 Breaking Changes Merge: initial version

* Add recent develop changes

* Sort recent develop changes

* Remove sections for ChibiOS changes per tzarc

No ChibiOS changes this round.

* Add and sort recent develop changes

* add notes about keyboard moves/deletions

* import changelog for PR 12172

Documents the change to BOOTMAGIC_ENABLE.

* update section headings

* re-sort changelog

* add additional note regarding Bootmagic changes

* remove changelog timestamp

* update dates in main Breaking Changes docs

* fix broken section anchors in previous changelogs

* add link to backlight/eeprom patch to changelog

* highlight some more changes

* link PRs from section headers

* Restore standard readme

* run: qmk cformat --core-only

64 files changed, 2424 insertions, 931 deletions

diff --git a/quantum/backlight/backlight.c b/quantum/backlight/backlight.c
index 113beb832..dfb98419e 100644
--- a/quantum/backlight/backlight.c
+++ b/quantum/backlight/backlight.c
@@ -17,11 +17,16 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "quantum.h"
 #include "backlight.h"
+#include "eeprom.h"
 #include "eeconfig.h"
 #include "debug.h"
 
 backlight_config_t backlight_config;
 
+#ifndef BACKLIGHT_DEFAULT_LEVEL
+#    define BACKLIGHT_DEFAULT_LEVEL BACKLIGHT_LEVELS
+#endif
+
 #ifdef BACKLIGHT_BREATHING
 // TODO: migrate to backlight_config_t
 static uint8_t breathing_period = BREATHING_PERIOD;
@@ -35,6 +40,7 @@ void backlight_init(void) {
     /* check signature */
     if (!eeconfig_is_enabled()) {
         eeconfig_init();
+        eeconfig_update_backlight_default();
     }
     backlight_config.raw = eeconfig_read_backlight();
     if (backlight_config.level > BACKLIGHT_LEVELS) {
@@ -152,11 +158,23 @@ void backlight_level(uint8_t level) {
     eeconfig_update_backlight(backlight_config.raw);
 }
 
-/** \brief Update current backlight state to EEPROM
- *
- */
+uint8_t eeconfig_read_backlight(void) { return eeprom_read_byte(EECONFIG_BACKLIGHT); }
+
+void eeconfig_update_backlight(uint8_t val) { eeprom_update_byte(EECONFIG_BACKLIGHT, val); }
+
 void eeconfig_update_backlight_current(void) { eeconfig_update_backlight(backlight_config.raw); }
 
+void eeconfig_update_backlight_default(void) {
+    backlight_config.enable = 1;
+#ifdef BACKLIGHT_DEFAULT_BREATHING
+    backlight_config.breathing = 1;
+#else
+    backlight_config.breathing = 0;
+#endif
+    backlight_config.level = BACKLIGHT_DEFAULT_LEVEL;
+    eeconfig_update_backlight(backlight_config.raw);
+}
+
 /** \brief Get backlight level
  *
  * FIXME: needs doc
diff --git a/quantum/backlight/backlight.h b/quantum/backlight/backlight.h
index 3e506737d..c30c70fd6 100644
--- a/quantum/backlight/backlight.h
+++ b/quantum/backlight/backlight.h
@@ -55,7 +55,11 @@ void    backlight_decrease(void);
 void    backlight_level_noeeprom(uint8_t level);
 void    backlight_level(uint8_t level);
 uint8_t get_backlight_level(void);
+
+uint8_t eeconfig_read_backlight(void);
+void    eeconfig_update_backlight(uint8_t val);
 void    eeconfig_update_backlight_current(void);
+void    eeconfig_update_backlight_default(void);
 
 // implementation specific
 void backlight_init_ports(void);
diff --git a/quantum/bootmagic/bootmagic.h b/quantum/bootmagic/bootmagic.h
new file mode 100644
index 000000000..959750178
--- /dev/null
+++ b/quantum/bootmagic/bootmagic.h
@@ -0,0 +1,24 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#if defined(BOOTMAGIC_ENABLE)
+#    include "bootmagic_full.h"
+#elif defined(BOOTMAGIC_LITE)
+#    include "bootmagic_lite.h"
+#endif
+
+void bootmagic(void);
diff --git a/quantum/bootmagic/bootmagic_full.c b/quantum/bootmagic/bootmagic_full.c
new file mode 100644
index 000000000..a7a0dcfcb
--- /dev/null
+++ b/quantum/bootmagic/bootmagic_full.c
@@ -0,0 +1,147 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stdint.h>
+#include <stdbool.h>
+#include "wait.h"
+#include "matrix.h"
+#include "bootloader.h"
+#include "debug.h"
+#include "keymap.h"
+#include "host.h"
+#include "action_layer.h"
+#include "eeconfig.h"
+#include "bootmagic.h"
+
+/** \brief Scan Keycode
+ *
+ * FIXME: needs doc
+ */
+static bool scan_keycode(uint8_t keycode) {
+    for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
+        matrix_row_t matrix_row = matrix_get_row(r);
+        for (uint8_t c = 0; c < MATRIX_COLS; c++) {
+            if (matrix_row & ((matrix_row_t)1 << c)) {
+                if (keycode == keymap_key_to_keycode(0, (keypos_t){.row = r, .col = c})) {
+                    return true;
+                }
+            }
+        }
+    }
+    return false;
+}
+
+/** \brief Bootmagic Scan Keycode
+ *
+ * FIXME: needs doc
+ */
+static bool bootmagic_scan_keycode(uint8_t keycode) {
+    if (!scan_keycode(BOOTMAGIC_KEY_SALT)) return false;
+
+    return scan_keycode(keycode);
+}
+
+void bootmagic(void) {
+    /* do scans in case of bounce */
+    print("bootmagic scan: ... ");
+    uint8_t scan = 100;
+    while (scan--) {
+        matrix_scan();
+        wait_ms(10);
+    }
+    print("done.\n");
+
+    /* bootmagic skip */
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_SKIP)) {
+        return;
+    }
+
+    /* eeconfig clear */
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_EEPROM_CLEAR)) {
+        eeconfig_init();
+    }
+
+    /* bootloader */
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_BOOTLOADER)) {
+        bootloader_jump();
+    }
+
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_DEBUG_ENABLE)) {
+        if (bootmagic_scan_keycode(BOOTMAGIC_KEY_DEBUG_MATRIX)) {
+            debug_config.matrix = !debug_config.matrix;
+        } else if (bootmagic_scan_keycode(BOOTMAGIC_KEY_DEBUG_KEYBOARD)) {
+            debug_config.keyboard = !debug_config.keyboard;
+        } else if (bootmagic_scan_keycode(BOOTMAGIC_KEY_DEBUG_MOUSE)) {
+            debug_config.mouse = !debug_config.mouse;
+        } else {
+            debug_config.enable = !debug_config.enable;
+        }
+    }
+    eeconfig_update_debug(debug_config.raw);
+
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_SWAP_CONTROL_CAPSLOCK)) {
+        keymap_config.swap_control_capslock = !keymap_config.swap_control_capslock;
+    }
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_CAPSLOCK_TO_CONTROL)) {
+        keymap_config.capslock_to_control = !keymap_config.capslock_to_control;
+    }
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_SWAP_LALT_LGUI)) {
+        keymap_config.swap_lalt_lgui = !keymap_config.swap_lalt_lgui;
+    }
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_SWAP_RALT_RGUI)) {
+        keymap_config.swap_ralt_rgui = !keymap_config.swap_ralt_rgui;
+    }
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_NO_GUI)) {
+        keymap_config.no_gui = !keymap_config.no_gui;
+    }
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_SWAP_GRAVE_ESC)) {
+        keymap_config.swap_grave_esc = !keymap_config.swap_grave_esc;
+    }
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_SWAP_BACKSLASH_BACKSPACE)) {
+        keymap_config.swap_backslash_backspace = !keymap_config.swap_backslash_backspace;
+    }
+    if (bootmagic_scan_keycode(BOOTMAGIC_HOST_NKRO)) {
+        keymap_config.nkro = !keymap_config.nkro;
+    }
+    eeconfig_update_keymap(keymap_config.raw);
+
+    /* default layer */
+    uint8_t default_layer = 0;
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_DEFAULT_LAYER_0)) {
+        default_layer |= (1 << 0);
+    } else if (bootmagic_scan_keycode(BOOTMAGIC_KEY_DEFAULT_LAYER_1)) {
+        default_layer |= (1 << 1);
+    } else if (bootmagic_scan_keycode(BOOTMAGIC_KEY_DEFAULT_LAYER_2)) {
+        default_layer |= (1 << 2);
+    } else if (bootmagic_scan_keycode(BOOTMAGIC_KEY_DEFAULT_LAYER_3)) {
+        default_layer |= (1 << 3);
+    } else if (bootmagic_scan_keycode(BOOTMAGIC_KEY_DEFAULT_LAYER_4)) {
+        default_layer |= (1 << 4);
+    } else if (bootmagic_scan_keycode(BOOTMAGIC_KEY_DEFAULT_LAYER_5)) {
+        default_layer |= (1 << 5);
+    } else if (bootmagic_scan_keycode(BOOTMAGIC_KEY_DEFAULT_LAYER_6)) {
+        default_layer |= (1 << 6);
+    } else if (bootmagic_scan_keycode(BOOTMAGIC_KEY_DEFAULT_LAYER_7)) {
+        default_layer |= (1 << 7);
+    }
+    eeconfig_update_default_layer(default_layer);
+
+    /* EE_HANDS handedness */
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_EE_HANDS_LEFT)) {
+        eeconfig_update_handedness(true);
+    } else if (bootmagic_scan_keycode(BOOTMAGIC_KEY_EE_HANDS_RIGHT)) {
+        eeconfig_update_handedness(false);
+    }
+}
diff --git a/quantum/bootmagic/bootmagic_full.h b/quantum/bootmagic/bootmagic_full.h
new file mode 100644
index 000000000..28f914c1b
--- /dev/null
+++ b/quantum/bootmagic/bootmagic_full.h
@@ -0,0 +1,115 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+/* FIXME: Add special doxygen comments for defines here. */
+
+/* bootmagic salt key */
+#ifndef BOOTMAGIC_KEY_SALT
+#    define BOOTMAGIC_KEY_SALT KC_SPACE
+#endif
+
+/* skip bootmagic and eeconfig */
+#ifndef BOOTMAGIC_KEY_SKIP
+#    define BOOTMAGIC_KEY_SKIP KC_ESC
+#endif
+
+/* eeprom clear */
+#ifndef BOOTMAGIC_KEY_EEPROM_CLEAR
+#    define BOOTMAGIC_KEY_EEPROM_CLEAR KC_BSPACE
+#endif
+
+/* kick up bootloader */
+#ifndef BOOTMAGIC_KEY_BOOTLOADER
+#    define BOOTMAGIC_KEY_BOOTLOADER KC_B
+#endif
+
+/* debug enable */
+#ifndef BOOTMAGIC_KEY_DEBUG_ENABLE
+#    define BOOTMAGIC_KEY_DEBUG_ENABLE KC_D
+#endif
+#ifndef BOOTMAGIC_KEY_DEBUG_MATRIX
+#    define BOOTMAGIC_KEY_DEBUG_MATRIX KC_X
+#endif
+#ifndef BOOTMAGIC_KEY_DEBUG_KEYBOARD
+#    define BOOTMAGIC_KEY_DEBUG_KEYBOARD KC_K
+#endif
+#ifndef BOOTMAGIC_KEY_DEBUG_MOUSE
+#    define BOOTMAGIC_KEY_DEBUG_MOUSE KC_M
+#endif
+#ifndef BOOTMAGIC_KEY_EE_HANDS_LEFT
+#    define BOOTMAGIC_KEY_EE_HANDS_LEFT KC_L
+#endif
+#ifndef BOOTMAGIC_KEY_EE_HANDS_RIGHT
+#    define BOOTMAGIC_KEY_EE_HANDS_RIGHT KC_R
+#endif
+
+/*
+ * keymap config
+ */
+#ifndef BOOTMAGIC_KEY_SWAP_CONTROL_CAPSLOCK
+#    define BOOTMAGIC_KEY_SWAP_CONTROL_CAPSLOCK KC_LCTRL
+#endif
+#ifndef BOOTMAGIC_KEY_CAPSLOCK_TO_CONTROL
+#    define BOOTMAGIC_KEY_CAPSLOCK_TO_CONTROL KC_CAPSLOCK
+#endif
+#ifndef BOOTMAGIC_KEY_SWAP_LALT_LGUI
+#    define BOOTMAGIC_KEY_SWAP_LALT_LGUI KC_LALT
+#endif
+#ifndef BOOTMAGIC_KEY_SWAP_RALT_RGUI
+#    define BOOTMAGIC_KEY_SWAP_RALT_RGUI KC_RALT
+#endif
+#ifndef BOOTMAGIC_KEY_NO_GUI
+#    define BOOTMAGIC_KEY_NO_GUI KC_LGUI
+#endif
+#ifndef BOOTMAGIC_KEY_SWAP_GRAVE_ESC
+#    define BOOTMAGIC_KEY_SWAP_GRAVE_ESC KC_GRAVE
+#endif
+#ifndef BOOTMAGIC_KEY_SWAP_BACKSLASH_BACKSPACE
+#    define BOOTMAGIC_KEY_SWAP_BACKSLASH_BACKSPACE KC_BSLASH
+#endif
+#ifndef BOOTMAGIC_HOST_NKRO
+#    define BOOTMAGIC_HOST_NKRO KC_N
+#endif
+
+/*
+ * change default layer
+ */
+#ifndef BOOTMAGIC_KEY_DEFAULT_LAYER_0
+#    define BOOTMAGIC_KEY_DEFAULT_LAYER_0 KC_0
+#endif
+#ifndef BOOTMAGIC_KEY_DEFAULT_LAYER_1
+#    define BOOTMAGIC_KEY_DEFAULT_LAYER_1 KC_1
+#endif
+#ifndef BOOTMAGIC_KEY_DEFAULT_LAYER_2
+#    define BOOTMAGIC_KEY_DEFAULT_LAYER_2 KC_2
+#endif
+#ifndef BOOTMAGIC_KEY_DEFAULT_LAYER_3
+#    define BOOTMAGIC_KEY_DEFAULT_LAYER_3 KC_3
+#endif
+#ifndef BOOTMAGIC_KEY_DEFAULT_LAYER_4
+#    define BOOTMAGIC_KEY_DEFAULT_LAYER_4 KC_4
+#endif
+#ifndef BOOTMAGIC_KEY_DEFAULT_LAYER_5
+#    define BOOTMAGIC_KEY_DEFAULT_LAYER_5 KC_5
+#endif
+#ifndef BOOTMAGIC_KEY_DEFAULT_LAYER_6
+#    define BOOTMAGIC_KEY_DEFAULT_LAYER_6 KC_6
+#endif
+#ifndef BOOTMAGIC_KEY_DEFAULT_LAYER_7
+#    define BOOTMAGIC_KEY_DEFAULT_LAYER_7 KC_7
+#endif
\ No newline at end of file
diff --git a/quantum/bootmagic/bootmagic_lite.c b/quantum/bootmagic/bootmagic_lite.c
new file mode 100644
index 000000000..9cbdcb0bb
--- /dev/null
+++ b/quantum/bootmagic/bootmagic_lite.c
@@ -0,0 +1,66 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "quantum.h"
+
+/** \brief Reset eeprom
+ *
+ * ...just incase someone wants to only change the eeprom behaviour
+ */
+__attribute__((weak)) void bootmagic_lite_reset_eeprom(void) {
+#if defined(VIA_ENABLE)
+    via_eeprom_reset();
+#else
+    eeconfig_disable();
+#endif
+}
+
+/** \brief The lite version of TMK's bootmagic based on Wilba.
+ *
+ *  100% less potential for accidentally making the keyboard do stupid things.
+ */
+__attribute__((weak)) void bootmagic_lite(void) {
+    // We need multiple scans because debouncing can't be turned off.
+    matrix_scan();
+#if defined(DEBOUNCE) && DEBOUNCE > 0
+    wait_ms(DEBOUNCE * 2);
+#else
+    wait_ms(30);
+#endif
+    matrix_scan();
+
+    // If the configured key (commonly Esc) is held down on power up,
+    // reset the EEPROM valid state and jump to bootloader.
+    // This isn't very generalized, but we need something that doesn't
+    // rely on user's keymaps in firmware or EEPROM.
+    uint8_t row = BOOTMAGIC_LITE_ROW;
+    uint8_t col = BOOTMAGIC_LITE_COLUMN;
+
+#if defined(SPLIT_KEYBOARD) && defined(BOOTMAGIC_LITE_ROW_RIGHT) && defined(BOOTMAGIC_LITE_COLUMN_RIGHT)
+    if (!is_keyboard_left()) {
+        row = BOOTMAGIC_LITE_ROW_RIGHT;
+        col = BOOTMAGIC_LITE_COLUMN_RIGHT;
+    }
+#endif
+
+    if (matrix_get_row(row) & (1 << col)) {
+        bootmagic_lite_reset_eeprom();
+
+        // Jump to bootloader.
+        bootloader_jump();
+    }
+}
+
+void bootmagic(void) { bootmagic_lite(); }
diff --git a/quantum/bootmagic/bootmagic_lite.h b/quantum/bootmagic/bootmagic_lite.h
new file mode 100644
index 000000000..17777e6b4
--- /dev/null
+++ b/quantum/bootmagic/bootmagic_lite.h
@@ -0,0 +1,25 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#ifndef BOOTMAGIC_LITE_COLUMN
+#    define BOOTMAGIC_LITE_COLUMN 0
+#endif
+#ifndef BOOTMAGIC_LITE_ROW
+#    define BOOTMAGIC_LITE_ROW 0
+#endif
+
+void bootmagic_lite(void);
diff --git a/quantum/bootmagic/magic.c b/quantum/bootmagic/magic.c
new file mode 100644
index 000000000..f1cb11c39
--- /dev/null
+++ b/quantum/bootmagic/magic.c
@@ -0,0 +1,54 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stdint.h>
+#include <stdbool.h>
+#include "wait.h"
+#include "matrix.h"
+#include "bootloader.h"
+#include "debug.h"
+#include "keymap.h"
+#include "host.h"
+#include "action_layer.h"
+#include "eeconfig.h"
+#include "bootmagic.h"
+
+keymap_config_t keymap_config;
+
+__attribute__((weak)) void bootmagic(void) {}
+
+/** \brief Magic
+ *
+ * FIXME: Needs doc
+ */
+void magic(void) {
+    /* check signature */
+    if (!eeconfig_is_enabled()) {
+        eeconfig_init();
+    }
+
+    /* init globals */
+    debug_config.raw  = eeconfig_read_debug();
+    keymap_config.raw = eeconfig_read_keymap();
+
+    bootmagic();
+
+    /* read here just incase bootmagic process changed its value */
+    layer_state_t default_layer = (layer_state_t)eeconfig_read_default_layer();
+    default_layer_set(default_layer);
+
+    /* Also initialize layer state to trigger callback functions for layer_state */
+    layer_state_set_kb((layer_state_t)layer_state);
+}
diff --git a/quantum/bootmagic/magic.h b/quantum/bootmagic/magic.h
new file mode 100644
index 000000000..2c3969b85
--- /dev/null
+++ b/quantum/bootmagic/magic.h
@@ -0,0 +1,18 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+void magic(void);
diff --git a/quantum/config_common.h b/quantum/config_common.h
index d93477b27..661609ef2 100644
--- a/quantum/config_common.h
+++ b/quantum/config_common.h
@@ -24,4 +24,7 @@
 #define COL2ROW 0
 #define ROW2COL 1
 
+// Deprecated alias - avoid using
+#define KEYMAP LAYOUT
+
 #include "song_list.h"
diff --git a/quantum/encoder.c b/quantum/encoder.c
index 2ed64c1e3..c30bf01cb 100644
--- a/quantum/encoder.c
+++ b/quantum/encoder.c
@@ -59,9 +59,9 @@ static uint8_t thisHand, thatHand;
 static uint8_t encoder_value[NUMBER_OF_ENCODERS] = {0};
 #endif
 
-__attribute__((weak)) void encoder_update_user(int8_t index, bool clockwise) {}
+__attribute__((weak)) bool encoder_update_user(uint8_t index, bool clockwise) { return true; }
 
-__attribute__((weak)) void encoder_update_kb(int8_t index, bool clockwise) { encoder_update_user(index, clockwise); }
+__attribute__((weak)) bool encoder_update_kb(uint8_t index, bool clockwise) { return encoder_update_user(index, clockwise); }
 
 void encoder_init(void) {
 #if defined(SPLIT_KEYBOARD) && defined(ENCODERS_PAD_A_RIGHT) && defined(ENCODERS_PAD_B_RIGHT)
@@ -94,14 +94,14 @@ void encoder_init(void) {
 #endif
 }
 
-static bool encoder_update(int8_t index, uint8_t state) {
+static bool encoder_update(uint8_t index, uint8_t state) {
     bool    changed = false;
     uint8_t i       = index;
 
 #ifdef ENCODER_RESOLUTIONS
-    int8_t resolution = encoder_resolutions[i];
+    uint8_t resolution = encoder_resolutions[i];
 #else
-    int8_t resolution = ENCODER_RESOLUTION;
+    uint8_t resolution = ENCODER_RESOLUTION;
 #endif
 
 #ifdef SPLIT_KEYBOARD
diff --git a/quantum/encoder.h b/quantum/encoder.h
index db6f220da..25dc77721 100644
--- a/quantum/encoder.h
+++ b/quantum/encoder.h
@@ -22,8 +22,8 @@
 void encoder_init(void);
 bool encoder_read(void);
 
-void encoder_update_kb(int8_t index, bool clockwise);
-void encoder_update_user(int8_t index, bool clockwise);
+bool encoder_update_kb(uint8_t index, bool clockwise);
+bool encoder_update_user(uint8_t index, bool clockwise);
 
 #ifdef SPLIT_KEYBOARD
 void encoder_state_raw(uint8_t* slave_state);
diff --git a/quantum/keycode_config.h b/quantum/keycode_config.h
index f878168c5..d7e334fdc 100644
--- a/quantum/keycode_config.h
+++ b/quantum/keycode_config.h
@@ -37,6 +37,7 @@ typedef union {
         bool nkro : 1;
         bool swap_lctl_lgui : 1;
         bool swap_rctl_rgui : 1;
+        bool oneshot_disable : 1;
     };
 } keymap_config_t;
 
diff --git a/quantum/led_matrix.c b/quantum/led_matrix.c
index 4f1f06c7a..d612fbfa9 100644
--- a/quantum/led_matrix.c
+++ b/quantum/led_matrix.c
@@ -17,79 +17,143 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <stdint.h>
-#include <stdbool.h>
-#include "quantum.h"
 #include "led_matrix.h"
 #include "progmem.h"
 #include "config.h"
 #include "eeprom.h"
 #include <string.h>
 #include <math.h>
+#include "led_tables.h"
 
-led_eeconfig_t led_matrix_eeconfig;
+#include <lib/lib8tion/lib8tion.h>
 
-#ifndef MAX
-#    define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
+#ifndef LED_MATRIX_CENTER
+const led_point_t k_led_matrix_center = {112, 32};
+#else
+const led_point_t k_led_matrix_center = LED_MATRIX_CENTER;
 #endif
 
-#ifndef MIN
-#    define MIN(a, b) ((a) < (b) ? (a) : (b))
+// Generic effect runners
+#include "led_matrix_runners/effect_runner_dx_dy_dist.h"
+#include "led_matrix_runners/effect_runner_dx_dy.h"
+#include "led_matrix_runners/effect_runner_i.h"
+#include "led_matrix_runners/effect_runner_sin_cos_i.h"
+#include "led_matrix_runners/effect_runner_reactive.h"
+#include "led_matrix_runners/effect_runner_reactive_splash.h"
+
+// ------------------------------------------
+// -----Begin led effect includes macros-----
+#define LED_MATRIX_EFFECT(name)
+#define LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+#include "led_matrix_animations/led_matrix_effects.inc"
+#ifdef LED_MATRIX_CUSTOM_KB
+#    include "led_matrix_kb.inc"
 #endif
+#ifdef LED_MATRIX_CUSTOM_USER
+#    include "led_matrix_user.inc"
+#endif
+
+#undef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#undef LED_MATRIX_EFFECT
+// -----End led effect includes macros-------
+// ------------------------------------------
 
-#ifndef LED_DISABLE_AFTER_TIMEOUT
-#    define LED_DISABLE_AFTER_TIMEOUT 0
+#if defined(LED_DISABLE_AFTER_TIMEOUT) && !defined(LED_DISABLE_TIMEOUT)
+#    define LED_DISABLE_TIMEOUT (LED_DISABLE_AFTER_TIMEOUT * 1200UL)
 #endif
 
-#ifndef LED_DISABLE_WHEN_USB_SUSPENDED
-#    define LED_DISABLE_WHEN_USB_SUSPENDED false
+#ifndef LED_DISABLE_TIMEOUT
+#    define LED_DISABLE_TIMEOUT 0
 #endif
 
-#ifndef EECONFIG_LED_MATRIX
-#    define EECONFIG_LED_MATRIX EECONFIG_RGBLIGHT
+#if LED_DISABLE_WHEN_USB_SUSPENDED == false
+#    undef LED_DISABLE_WHEN_USB_SUSPENDED
 #endif
 
-#if !defined(LED_MATRIX_MAXIMUM_BRIGHTNESS) || LED_MATRIX_MAXIMUM_BRIGHTNESS > 255
-#    define LED_MATRIX_MAXIMUM_BRIGHTNESS 255
+#if !defined(LED_MATRIX_MAXIMUM_BRIGHTNESS) || LED_MATRIX_MAXIMUM_BRIGHTNESS > UINT8_MAX
+#    undef LED_MATRIX_MAXIMUM_BRIGHTNESS
+#    define LED_MATRIX_MAXIMUM_BRIGHTNESS UINT8_MAX
 #endif
 
-bool g_suspend_state = false;
+#if !defined(LED_MATRIX_VAL_STEP)
+#    define LED_MATRIX_VAL_STEP 8
+#endif
 
-// Global tick at 20 Hz
-uint32_t g_tick = 0;
+#if !defined(LED_MATRIX_SPD_STEP)
+#    define LED_MATRIX_SPD_STEP 16
+#endif
 
-// Ticks since this key was last hit.
-uint8_t g_key_hit[DRIVER_LED_TOTAL];
+#if !defined(LED_MATRIX_STARTUP_MODE)
+#    define LED_MATRIX_STARTUP_MODE LED_MATRIX_SOLID
+#endif
 
-// Ticks since any key was last hit.
-uint32_t g_any_key_hit = 0;
+#if !defined(LED_MATRIX_STARTUP_VAL)
+#    define LED_MATRIX_STARTUP_VAL LED_MATRIX_MAXIMUM_BRIGHTNESS
+#endif
 
-uint32_t eeconfig_read_led_matrix(void) { return eeprom_read_dword(EECONFIG_LED_MATRIX); }
+#if !defined(LED_MATRIX_STARTUP_SPD)
+#    define LED_MATRIX_STARTUP_SPD UINT8_MAX / 2
+#endif
 
-void eeconfig_update_led_matrix(uint32_t config_value) { eeprom_update_dword(EECONFIG_LED_MATRIX, config_value); }
+// globals
+led_eeconfig_t led_matrix_eeconfig;  // TODO: would like to prefix this with g_ for global consistancy, do this in another pr
+uint32_t       g_led_timer;
+#ifdef LED_MATRIX_FRAMEBUFFER_EFFECTS
+uint8_t g_led_frame_buffer[MATRIX_ROWS][MATRIX_COLS] = {{0}};
+#endif  // LED_MATRIX_FRAMEBUFFER_EFFECTS
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+last_hit_t g_last_hit_tracker;
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
+
+// internals
+static bool            suspend_state     = false;
+static uint8_t         led_last_enable   = UINT8_MAX;
+static uint8_t         led_last_effect   = UINT8_MAX;
+static effect_params_t led_effect_params = {0, LED_FLAG_ALL, false};
+static led_task_states led_task_state    = SYNCING;
+#if LED_DISABLE_TIMEOUT > 0
+static uint32_t led_anykey_timer;
+#endif  // LED_DISABLE_TIMEOUT > 0
+
+// double buffers
+static uint32_t led_timer_buffer;
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+static last_hit_t last_hit_buffer;
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
+
+// split led matrix
+#if defined(LED_MATRIX_ENABLE) && defined(LED_MATRIX_SPLIT)
+const uint8_t k_led_matrix_split[2] = LED_MATRIX_SPLIT;
+#endif
+
+void eeconfig_read_led_matrix(void) { eeprom_read_block(&led_matrix_eeconfig, EECONFIG_LED_MATRIX, sizeof(led_matrix_eeconfig)); }
+
+void eeconfig_update_led_matrix(void) { eeprom_update_block(&led_matrix_eeconfig, EECONFIG_LED_MATRIX, sizeof(led_matrix_eeconfig)); }
 
 void eeconfig_update_led_matrix_default(void) {
     dprintf("eeconfig_update_led_matrix_default\n");
     led_matrix_eeconfig.enable = 1;
-    led_matrix_eeconfig.mode   = LED_MATRIX_UNIFORM_BRIGHTNESS;
-    led_matrix_eeconfig.val    = 128;
-    led_matrix_eeconfig.speed  = 0;
-    eeconfig_update_led_matrix(led_matrix_eeconfig.raw);
+    led_matrix_eeconfig.mode   = LED_MATRIX_STARTUP_MODE;
+    led_matrix_eeconfig.val    = LED_MATRIX_STARTUP_VAL;
+    led_matrix_eeconfig.speed  = LED_MATRIX_STARTUP_SPD;
+    led_matrix_eeconfig.flags  = LED_FLAG_ALL;
+    eeconfig_update_led_matrix();
 }
 
 void eeconfig_debug_led_matrix(void) {
-    dprintf("led_matrix_eeconfig eeprom\n");
+    dprintf("led_matrix_eeconfig EEPROM\n");
     dprintf("led_matrix_eeconfig.enable = %d\n", led_matrix_eeconfig.enable);
     dprintf("led_matrix_eeconfig.mode = %d\n", led_matrix_eeconfig.mode);
     dprintf("led_matrix_eeconfig.val = %d\n", led_matrix_eeconfig.val);
     dprintf("led_matrix_eeconfig.speed = %d\n", led_matrix_eeconfig.speed);
+    dprintf("led_matrix_eeconfig.flags = %d\n", led_matrix_eeconfig.flags);
 }
 
-uint8_t g_last_led_hit[LED_HITS_TO_REMEMBER] = {255};
-uint8_t g_last_led_count                     = 0;
+__attribute__((weak)) uint8_t led_matrix_map_row_column_to_led_kb(uint8_t row, uint8_t column, uint8_t *led_i) { return 0; }
 
-uint8_t map_row_column_to_led(uint8_t row, uint8_t column, uint8_t *led_i) {
-    uint8_t led_count = 0;
+uint8_t led_matrix_map_row_column_to_led(uint8_t row, uint8_t column, uint8_t *led_i) {
+    uint8_t led_count = led_matrix_map_row_column_to_led_kb(row, column, led_i);
     uint8_t led_index = g_led_config.matrix_co[row][column];
     if (led_index != NO_LED) {
         led_i[led_count] = led_index;
@@ -100,88 +164,235 @@ uint8_t map_row_column_to_led(uint8_t row, uint8_t column, uint8_t *led_i) {
 
 void led_matrix_update_pwm_buffers(void) { led_matrix_driver.flush(); }
 
-void led_matrix_set_index_value(int index, uint8_t value) { led_matrix_driver.set_value(index, value); }
-
-void led_matrix_set_index_value_all(uint8_t value) { led_matrix_driver.set_value_all(value); }
-
-bool process_led_matrix(uint16_t keycode, keyrecord_t *record) {
-    if (record->event.pressed) {
-        uint8_t led[8];
-        uint8_t led_count = map_row_column_to_led(record->event.key.row, record->event.key.col, led);
-        if (led_count > 0) {
-            for (uint8_t i = LED_HITS_TO_REMEMBER; i > 1; i--) {
-                g_last_led_hit[i - 1] = g_last_led_hit[i - 2];
-            }
-            g_last_led_hit[0] = led[0];
-            g_last_led_count  = MIN(LED_HITS_TO_REMEMBER, g_last_led_count + 1);
-        }
-        for (uint8_t i = 0; i < led_count; i++) g_key_hit[led[i]] = 0;
-        g_any_key_hit = 0;
-    } else {
-#ifdef LED_MATRIX_KEYRELEASES
-        uint8_t led[8];
-        uint8_t led_count = map_row_column_to_led(record->event.key.row, record->event.key.col, led);
-        for (uint8_t i = 0; i < led_count; i++) g_key_hit[led[i]] = 255;
+void led_matrix_set_value(int index, uint8_t value) {
+#if defined(LED_MATRIX_ENABLE) && defined(LED_MATRIX_SPLIT)
+    if (!is_keyboard_left() && index >= k_led_matrix_split[0])
+#    ifdef USE_CIE1931_CURVE
+        led_matrix_driver.set_value(index - k_led_matrix_split[0], pgm_read_byte(&CIE1931_CURVE[value]));
+#    else
+        led_matrix_driver.set_value(index - k_led_matrix_split[0], value);
+#    endif
+    else if (is_keyboard_left() && index < k_led_matrix_split[0])
+#endif
+#ifdef USE_CIE1931_CURVE
+        led_matrix_driver.set_value(index, pgm_read_byte(&CIE1931_CURVE[value]));
+#else
+    led_matrix_driver.set_value(index, value);
+#endif
+}
 
-        g_any_key_hit = 255;
+void led_matrix_set_value_all(uint8_t value) {
+#if defined(LED_MATRIX_ENABLE) && defined(LED_MATRIX_SPLIT)
+    for (uint8_t i = 0; i < DRIVER_LED_TOTAL; i++) led_matrix_set_value(i, value);
+#else
+#    ifdef USE_CIE1931_CURVE
+    led_matrix_driver.set_value_all(pgm_read_byte(&CIE1931_CURVE[value]));
+#    else
+    led_matrix_driver.set_value_all(value);
+#    endif
 #endif
-    }
-    return true;
 }
 
-void led_matrix_set_suspend_state(bool state) { g_suspend_state = state; }
+void process_led_matrix(uint8_t row, uint8_t col, bool pressed) {
+#ifndef LED_MATRIX_SPLIT
+    if (!is_keyboard_master()) return;
+#endif
+#if LED_DISABLE_TIMEOUT > 0
+    led_anykey_timer = 0;
+#endif  // LED_DISABLE_TIMEOUT > 0
 
-// All LEDs off
-void led_matrix_all_off(void) { led_matrix_set_index_value_all(0); }
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+    uint8_t led[LED_HITS_TO_REMEMBER];
+    uint8_t led_count = 0;
 
-// Uniform brightness
-void led_matrix_uniform_brightness(void) { led_matrix_set_index_value_all(LED_MATRIX_MAXIMUM_BRIGHTNESS / BACKLIGHT_LEVELS * led_matrix_eeconfig.val); }
+#    if defined(LED_MATRIX_KEYRELEASES)
+    if (!pressed)
+#    elif defined(LED_MATRIX_KEYPRESSES)
+    if (pressed)
+#    endif  // defined(LED_MATRIX_KEYRELEASES)
+    {
+        led_count = led_matrix_map_row_column_to_led(row, col, led);
+    }
 
-void led_matrix_custom(void) {}
+    if (last_hit_buffer.count + led_count > LED_HITS_TO_REMEMBER) {
+        memcpy(&last_hit_buffer.x[0], &last_hit_buffer.x[led_count], LED_HITS_TO_REMEMBER - led_count);
+        memcpy(&last_hit_buffer.y[0], &last_hit_buffer.y[led_count], LED_HITS_TO_REMEMBER - led_count);
+        memcpy(&last_hit_buffer.tick[0], &last_hit_buffer.tick[led_count], (LED_HITS_TO_REMEMBER - led_count) * 2);  // 16 bit
+        memcpy(&last_hit_buffer.index[0], &last_hit_buffer.index[led_count], LED_HITS_TO_REMEMBER - led_count);
+        last_hit_buffer.count--;
+    }
 
-void led_matrix_task(void) {
-    if (!led_matrix_eeconfig.enable) {
-        led_matrix_all_off();
-        led_matrix_indicators();
-        return;
+    for (uint8_t i = 0; i < led_count; i++) {
+        uint8_t index                = last_hit_buffer.count;
+        last_hit_buffer.x[index]     = g_led_config.point[led[i]].x;
+        last_hit_buffer.y[index]     = g_led_config.point[led[i]].y;
+        last_hit_buffer.index[index] = led[i];
+        last_hit_buffer.tick[index]  = 0;
+        last_hit_buffer.count++;
     }
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
 
-    g_tick++;
+#if defined(LED_MATRIX_FRAMEBUFFER_EFFECTS) && !defined(DISABLE_LED_MATRIX_TYPING_HEATMAP)
+    if (led_matrix_eeconfig.mode == LED_MATRIX_TYPING_HEATMAP) {
+        process_led_matrix_typing_heatmap(row, col);
+    }
+#endif  // defined(LED_MATRIX_FRAMEBUFFER_EFFECTS) && !defined(DISABLE_LED_MATRIX_TYPING_HEATMAP)
+}
 
-    if (g_any_key_hit < 0xFFFFFFFF) {
-        g_any_key_hit++;
+static bool led_matrix_none(effect_params_t *params) {
+    if (!params->init) {
+        return false;
     }
 
-    for (int led = 0; led < DRIVER_LED_TOTAL; led++) {
-        if (g_key_hit[led] < 255) {
-            if (g_key_hit[led] == 254) g_last_led_count = MAX(g_last_led_count - 1, 0);
-            g_key_hit[led]++;
+    led_matrix_set_value_all(0);
+    return false;
+}
+
+static void led_task_timers(void) {
+#if defined(LED_MATRIX_KEYREACTIVE_ENABLED) || LED_DISABLE_TIMEOUT > 0
+    uint32_t deltaTime = sync_timer_elapsed32(led_timer_buffer);
+#endif  // defined(LED_MATRIX_KEYREACTIVE_ENABLED) || LED_DISABLE_TIMEOUT > 0
+    led_timer_buffer = sync_timer_read32();
+
+    // Update double buffer timers
+#if LED_DISABLE_TIMEOUT > 0
+    if (led_anykey_timer < UINT32_MAX) {
+        if (UINT32_MAX - deltaTime < led_anykey_timer) {
+            led_anykey_timer = UINT32_MAX;
+        } else {
+            led_anykey_timer += deltaTime;
         }
     }
+#endif  // LED_DISABLE_TIMEOUT > 0
+
+    // Update double buffer last hit timers
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+    uint8_t count = last_hit_buffer.count;
+    for (uint8_t i = 0; i < count; ++i) {
+        if (UINT16_MAX - deltaTime < last_hit_buffer.tick[i]) {
+            last_hit_buffer.count--;
+            continue;
+        }
+        last_hit_buffer.tick[i] += deltaTime;
+    }
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
+}
 
-    // Ideally we would also stop sending zeros to the LED driver PWM buffers
-    // while suspended and just do a software shutdown. This is a cheap hack for now.
-    bool    suspend_backlight = ((g_suspend_state && LED_DISABLE_WHEN_USB_SUSPENDED) || (LED_DISABLE_AFTER_TIMEOUT > 0 && g_any_key_hit > LED_DISABLE_AFTER_TIMEOUT * 60 * 20));
-    uint8_t effect            = suspend_backlight ? 0 : led_matrix_eeconfig.mode;
+static void led_task_sync(void) {
+    // next task
+    if (sync_timer_elapsed32(g_led_timer) >= LED_MATRIX_LED_FLUSH_LIMIT) led_task_state = STARTING;
+}
+
+static void led_task_start(void) {
+    // reset iter
+    led_effect_params.iter = 0;
+
+    // update double buffers
+    g_led_timer = led_timer_buffer;
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+    g_last_hit_tracker = last_hit_buffer;
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
+
+    // next task
+    led_task_state = RENDERING;
+}
+
+static void led_task_render(uint8_t effect) {
+    bool rendering         = false;
+    led_effect_params.init = (effect != led_last_effect) || (led_matrix_eeconfig.enable != led_last_enable);
+    if (led_effect_params.flags != led_matrix_eeconfig.flags) {
+        led_effect_params.flags = led_matrix_eeconfig.flags;
+        led_matrix_set_value_all(0);
+    }
 
-    // this gets ticked at 20 Hz.
     // each effect can opt to do calculations
     // and/or request PWM buffer updates.
     switch (effect) {
-        case LED_MATRIX_UNIFORM_BRIGHTNESS:
-            led_matrix_uniform_brightness();
+        case LED_MATRIX_NONE:
+            rendering = led_matrix_none(&led_effect_params);
             break;
-        default:
-            led_matrix_custom();
+
+// ---------------------------------------------
+// -----Begin led effect switch case macros-----
+#define LED_MATRIX_EFFECT(name, ...)          \
+    case LED_MATRIX_##name:                   \
+        rendering = name(&led_effect_params); \
+        break;
+#include "led_matrix_animations/led_matrix_effects.inc"
+#undef LED_MATRIX_EFFECT
+
+#if defined(LED_MATRIX_CUSTOM_KB) || defined(LED_MATRIX_CUSTOM_USER)
+#    define LED_MATRIX_EFFECT(name, ...)          \
+        case LED_MATRIX_CUSTOM_##name:            \
+            rendering = name(&led_effect_params); \
             break;
+#    ifdef LED_MATRIX_CUSTOM_KB
+#        include "led_matrix_kb.inc"
+#    endif
+#    ifdef LED_MATRIX_CUSTOM_USER
+#        include "led_matrix_user.inc"
+#    endif
+#    undef LED_MATRIX_EFFECT
+#endif
+            // -----End led effect switch case macros-------
+            // ---------------------------------------------
     }
 
-    if (!suspend_backlight) {
-        led_matrix_indicators();
+    led_effect_params.iter++;
+
+    // next task
+    if (!rendering) {
+        led_task_state = FLUSHING;
+        if (!led_effect_params.init && effect == LED_MATRIX_NONE) {
+            // We only need to flush once if we are LED_MATRIX_NONE
+            led_task_state = SYNCING;
+        }
     }
+}
+
+static void led_task_flush(uint8_t effect) {
+    // update last trackers after the first full render so we can init over several frames
+    led_last_effect = effect;
+    led_last_enable = led_matrix_eeconfig.enable;
+
+    // update pwm buffers
+    led_matrix_update_pwm_buffers();
 
-    // Tell the LED driver to update its state
-    led_matrix_driver.flush();
+    // next task
+    led_task_state = SYNCING;
+}
+
+void led_matrix_task(void) {
+    led_task_timers();
+
+    // Ideally we would also stop sending zeros to the LED driver PWM buffers
+    // while suspended and just do a software shutdown. This is a cheap hack for now.
+    bool suspend_backlight = suspend_state ||
+#if LED_DISABLE_TIMEOUT > 0
+                             (led_anykey_timer > (uint32_t)LED_DISABLE_TIMEOUT) ||
+#endif  // LED_DISABLE_TIMEOUT > 0
+                             false;
+
+    uint8_t effect = suspend_backlight || !led_matrix_eeconfig.enable ? 0 : led_matrix_eeconfig.mode;
+
+    switch (led_task_state) {
+        case STARTING:
+            led_task_start();
+            break;
+        case RENDERING:
+            led_task_render(effect);
+            if (effect) {
+                led_matrix_indicators();
+                led_matrix_indicators_advanced(&led_effect_params);
+            }
+            break;
+        case FLUSHING:
+            led_task_flush(effect);
+            break;
+        case SYNCING:
+            led_task_sync();
+            break;
+    }
 }
 
 void led_matrix_indicators(void) {
@@ -193,33 +404,42 @@ __attribute__((weak)) void led_matrix_indicators_kb(void) {}
 
 __attribute__((weak)) void led_matrix_indicators_user(void) {}
 
-// void led_matrix_set_indicator_index(uint8_t *index, uint8_t row, uint8_t column)
-// {
-//  if (row >= MATRIX_ROWS)
-//  {
-//      // Special value, 255=none, 254=all
-//      *index = row;
-//  }
-//  else
-//  {
-//      // This needs updated to something like
-//      // uint8_t led[8];
-//      // uint8_t led_count = map_row_column_to_led(row, column, led);
-//      // for(uint8_t i = 0; i < led_count; i++)
-//      map_row_column_to_led(row, column, index);
-//  }
-// }
+void led_matrix_indicators_advanced(effect_params_t *params) {
+    /* special handling is needed for "params->iter", since it's already been incremented.
+     * Could move the invocations to led_task_render, but then it's missing a few checks
+     * and not sure which would be better. Otherwise, this should be called from
+     * led_task_render, right before the iter++ line.
+     */
+#if defined(LED_MATRIX_LED_PROCESS_LIMIT) && LED_MATRIX_LED_PROCESS_LIMIT > 0 && LED_MATRIX_LED_PROCESS_LIMIT < DRIVER_LED_TOTAL
+    uint8_t min = LED_MATRIX_LED_PROCESS_LIMIT * (params->iter - 1);
+    uint8_t max = min + LED_MATRIX_LED_PROCESS_LIMIT;
+    if (max > DRIVER_LED_TOTAL) max = DRIVER_LED_TOTAL;
+#else
+    uint8_t min = 0;
+    uint8_t max = DRIVER_LED_TOTAL;
+#endif
+    led_matrix_indicators_advanced_kb(min, max);
+    led_matrix_indicators_advanced_user(min, max);
+}
+
+__attribute__((weak)) void led_matrix_indicators_advanced_kb(uint8_t led_min, uint8_t led_max) {}
+
+__attribute__((weak)) void led_matrix_indicators_advanced_user(uint8_t led_min, uint8_t led_max) {}
 
 void led_matrix_init(void) {
     led_matrix_driver.init();
 
-    // Wait half a second for the driver to finish initializing
-    wait_ms(500);
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+    g_last_hit_tracker.count = 0;
+    for (uint8_t i = 0; i < LED_HITS_TO_REMEMBER; ++i) {
+        g_last_hit_tracker.tick[i] = UINT16_MAX;
+    }
 
-    // clear the key hits
-    for (int led = 0; led < DRIVER_LED_TOTAL; led++) {
-        g_key_hit[led] = 255;
+    last_hit_buffer.count = 0;
+    for (uint8_t i = 0; i < LED_HITS_TO_REMEMBER; ++i) {
+        last_hit_buffer.tick[i] = UINT16_MAX;
     }
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
 
     if (!eeconfig_is_enabled()) {
         dprintf("led_matrix_init_drivers eeconfig is not enabled.\n");
@@ -227,122 +447,137 @@ void led_matrix_init(void) {
         eeconfig_update_led_matrix_default();
     }
 
-    led_matrix_eeconfig.raw = eeconfig_read_led_matrix();
-
+    eeconfig_read_led_matrix();
     if (!led_matrix_eeconfig.mode) {
         dprintf("led_matrix_init_drivers led_matrix_eeconfig.mode = 0. Write default values to EEPROM.\n");
         eeconfig_update_led_matrix_default();
-        led_matrix_eeconfig.raw = eeconfig_read_led_matrix();
     }
-
     eeconfig_debug_led_matrix();  // display current eeprom values
 }
 
-// Deals with the messy details of incrementing an integer
-static uint8_t increment(uint8_t value, uint8_t step, uint8_t min, uint8_t max) {
-    int16_t new_value = value;
-    new_value += step;
-    return MIN(MAX(new_value, min), max);
+void led_matrix_set_suspend_state(bool state) {
+#ifdef LED_DISABLE_WHEN_USB_SUSPENDED
+    if (state) {
+        led_matrix_set_value_all(0);  // turn off all LEDs when suspending
+    }
+    suspend_state = state;
+#endif
 }
 
-static uint8_t decrement(uint8_t value, uint8_t step, uint8_t min, uint8_t max) {
-    int16_t new_value = value;
-    new_value -= step;
-    return MIN(MAX(new_value, min), max);
-}
+bool led_matrix_get_suspend_state(void) { return suspend_state; }
 
-// void *backlight_get_custom_key_value_eeprom_address(uint8_t led) {
-//     // 3 bytes per value
-//     return EECONFIG_LED_MATRIX + (led * 3);
-// }
-
-// void backlight_get_key_value(uint8_t led, uint8_t *value) {
-//     void *address = backlight_get_custom_key_value_eeprom_address(led);
-//     value = eeprom_read_byte(address);
-// }
-
-// void backlight_set_key_value(uint8_t row, uint8_t column, uint8_t value) {
-//     uint8_t led[8];
-//     uint8_t led_count = map_row_column_to_led(row, column, led);
-//     for(uint8_t i = 0; i < led_count; i++) {
-//         if (led[i] < DRIVER_LED_TOTAL) {
-//             void *address = backlight_get_custom_key_value_eeprom_address(led[i]);
-//             eeprom_update_byte(address, value);
-//         }
-//     }
-// }
-
-uint32_t led_matrix_get_tick(void) { return g_tick; }
-
-void led_matrix_toggle(void) {
+void led_matrix_toggle_eeprom_helper(bool write_to_eeprom) {
     led_matrix_eeconfig.enable ^= 1;
-    eeconfig_update_led_matrix(led_matrix_eeconfig.raw);
+    led_task_state = STARTING;
+    if (write_to_eeprom) {
+        eeconfig_update_led_matrix();
+    }
+    dprintf("led matrix toggle [%s]: led_matrix_eeconfig.enable = %u\n", (write_to_eeprom) ? "EEPROM" : "NOEEPROM", led_matrix_eeconfig.enable);
 }
+void led_matrix_toggle_noeeprom(void) { led_matrix_toggle_eeprom_helper(false); }
+void led_matrix_toggle(void) { led_matrix_toggle_eeprom_helper(true); }
 
 void led_matrix_enable(void) {
-    led_matrix_eeconfig.enable = 1;
-    eeconfig_update_led_matrix(led_matrix_eeconfig.raw);
+    led_matrix_enable_noeeprom();
+    eeconfig_update_led_matrix();
 }
 
-void led_matrix_enable_noeeprom(void) { led_matrix_eeconfig.enable = 1; }
+void led_matrix_enable_noeeprom(void) {
+    if (!led_matrix_eeconfig.enable) led_task_state = STARTING;
+    led_matrix_eeconfig.enable = 1;
+}
 
 void led_matrix_disable(void) {
+    led_matrix_disable_noeeprom();
+    eeconfig_update_led_matrix();
+}
+
+void led_matrix_disable_noeeprom(void) {
+    if (led_matrix_eeconfig.enable) led_task_state = STARTING;
     led_matrix_eeconfig.enable = 0;
-    eeconfig_update_led_matrix(led_matrix_eeconfig.raw);
 }
 
-void led_matrix_disable_noeeprom(void) { led_matrix_eeconfig.enable = 0; }
+uint8_t led_matrix_is_enabled(void) { return led_matrix_eeconfig.enable; }
 
-void led_matrix_step(void) {
-    led_matrix_eeconfig.mode++;
-    if (led_matrix_eeconfig.mode >= LED_MATRIX_EFFECT_MAX) {
-        led_matrix_eeconfig.mode = 1;
+void led_matrix_mode_eeprom_helper(uint8_t mode, bool write_to_eeprom) {
+    if (!led_matrix_eeconfig.enable) {
+        return;
     }
-    eeconfig_update_led_matrix(led_matrix_eeconfig.raw);
-}
-
-void led_matrix_step_reverse(void) {
-    led_matrix_eeconfig.mode--;
-    if (led_matrix_eeconfig.mode < 1) {
+    if (mode < 1) {
+        led_matrix_eeconfig.mode = 1;
+    } else if (mode >= LED_MATRIX_EFFECT_MAX) {
         led_matrix_eeconfig.mode = LED_MATRIX_EFFECT_MAX - 1;
+    } else {
+        led_matrix_eeconfig.mode = mode;
+    }
+    led_task_state = STARTING;
+    if (write_to_eeprom) {
+        eeconfig_update_led_matrix();
     }
-    eeconfig_update_led_matrix(led_matrix_eeconfig.raw);
+    dprintf("led matrix mode [%s]: %u\n", (write_to_eeprom) ? "EEPROM" : "NOEEPROM", led_matrix_eeconfig.mode);
 }
+void led_matrix_mode_noeeprom(uint8_t mode) { led_matrix_mode_eeprom_helper(mode, false); }
+void led_matrix_mode(uint8_t mode) { led_matrix_mode_eeprom_helper(mode, true); }
 
-void led_matrix_increase_val(void) {
-    led_matrix_eeconfig.val = increment(led_matrix_eeconfig.val, 8, 0, LED_MATRIX_MAXIMUM_BRIGHTNESS);
-    eeconfig_update_led_matrix(led_matrix_eeconfig.raw);
-}
+uint8_t led_matrix_get_mode(void) { return led_matrix_eeconfig.mode; }
 
-void led_matrix_decrease_val(void) {
-    led_matrix_eeconfig.val = decrement(led_matrix_eeconfig.val, 8, 0, LED_MATRIX_MAXIMUM_BRIGHTNESS);
-    eeconfig_update_led_matrix(led_matrix_eeconfig.raw);
+void led_matrix_step_helper(bool write_to_eeprom) {
+    uint8_t mode = led_matrix_eeconfig.mode + 1;
+    led_matrix_mode_eeprom_helper((mode < LED_MATRIX_EFFECT_MAX) ? mode : 1, write_to_eeprom);
 }
+void led_matrix_step_noeeprom(void) { led_matrix_step_helper(false); }
+void led_matrix_step(void) { led_matrix_step_helper(true); }
 
-void led_matrix_increase_speed(void) {
-    led_matrix_eeconfig.speed = increment(led_matrix_eeconfig.speed, 1, 0, 3);
-    eeconfig_update_led_matrix(led_matrix_eeconfig.raw);  // EECONFIG needs to be increased to support this
+void led_matrix_step_reverse_helper(bool write_to_eeprom) {
+    uint8_t mode = led_matrix_eeconfig.mode - 1;
+    led_matrix_mode_eeprom_helper((mode < 1) ? LED_MATRIX_EFFECT_MAX - 1 : mode, write_to_eeprom);
 }
+void led_matrix_step_reverse_noeeprom(void) { led_matrix_step_reverse_helper(false); }
+void led_matrix_step_reverse(void) { led_matrix_step_reverse_helper(true); }
 
-void led_matrix_decrease_speed(void) {
-    led_matrix_eeconfig.speed = decrement(led_matrix_eeconfig.speed, 1, 0, 3);
-    eeconfig_update_led_matrix(led_matrix_eeconfig.raw);  // EECONFIG needs to be increased to support this
+void led_matrix_set_val_eeprom_helper(uint8_t val, bool write_to_eeprom) {
+    if (!led_matrix_eeconfig.enable) {
+        return;
+    }
+    led_matrix_eeconfig.val = (val > LED_MATRIX_MAXIMUM_BRIGHTNESS) ? LED_MATRIX_MAXIMUM_BRIGHTNESS : val;
+    if (write_to_eeprom) {
+        eeconfig_update_led_matrix();
+    }
+    dprintf("led matrix set val [%s]: %u\n", (write_to_eeprom) ? "EEPROM" : "NOEEPROM", led_matrix_eeconfig.val);
 }
+void led_matrix_set_val_noeeprom(uint8_t val) { led_matrix_set_val_eeprom_helper(val, false); }
+void led_matrix_set_val(uint8_t val) { led_matrix_set_val_eeprom_helper(val, true); }
 
-void led_matrix_mode(uint8_t mode, bool eeprom_write) {
-    led_matrix_eeconfig.mode = mode;
-    if (eeprom_write) {
-        eeconfig_update_led_matrix(led_matrix_eeconfig.raw);
+uint8_t led_matrix_get_val(void) { return led_matrix_eeconfig.val; }
+
+void led_matrix_increase_val_helper(bool write_to_eeprom) { led_matrix_set_val_eeprom_helper(qadd8(led_matrix_eeconfig.val, LED_MATRIX_VAL_STEP), write_to_eeprom); }
+void led_matrix_increase_val_noeeprom(void) { led_matrix_increase_val_helper(false); }
+void led_matrix_increase_val(void) { led_matrix_increase_val_helper(true); }
+
+void led_matrix_decrease_val_helper(bool write_to_eeprom) { led_matrix_set_val_eeprom_helper(qsub8(led_matrix_eeconfig.val, LED_MATRIX_VAL_STEP), write_to_eeprom); }
+void led_matrix_decrease_val_noeeprom(void) { led_matrix_decrease_val_helper(false); }
+void led_matrix_decrease_val(void) { led_matrix_decrease_val_helper(true); }
+
+void led_matrix_set_speed_eeprom_helper(uint8_t speed, bool write_to_eeprom) {
+    led_matrix_eeconfig.speed = speed;
+    if (write_to_eeprom) {
+        eeconfig_update_led_matrix();
     }
+    dprintf("led matrix set speed [%s]: %u\n", (write_to_eeprom) ? "EEPROM" : "NOEEPROM", led_matrix_eeconfig.speed);
 }
+void led_matrix_set_speed_noeeprom(uint8_t speed) { led_matrix_set_speed_eeprom_helper(speed, false); }
+void led_matrix_set_speed(uint8_t speed) { led_matrix_set_speed_eeprom_helper(speed, true); }
 
-uint8_t led_matrix_get_mode(void) { return led_matrix_eeconfig.mode; }
+uint8_t led_matrix_get_speed(void) { return led_matrix_eeconfig.speed; }
 
-void led_matrix_set_value_noeeprom(uint8_t val) { led_matrix_eeconfig.val = val; }
+void led_matrix_increase_speed_helper(bool write_to_eeprom) { led_matrix_set_speed_eeprom_helper(qadd8(led_matrix_eeconfig.speed, LED_MATRIX_SPD_STEP), write_to_eeprom); }
+void led_matrix_increase_speed_noeeprom(void) { led_matrix_increase_speed_helper(false); }
+void led_matrix_increase_speed(void) { led_matrix_increase_speed_helper(true); }
 
-void led_matrix_set_value(uint8_t val) {
-    led_matrix_set_value_noeeprom(val);
-    eeconfig_update_led_matrix(led_matrix_eeconfig.raw);
-}
+void led_matrix_decrease_speed_helper(bool write_to_eeprom) { led_matrix_set_speed_eeprom_helper(qsub8(led_matrix_eeconfig.speed, LED_MATRIX_SPD_STEP), write_to_eeprom); }
+void led_matrix_decrease_speed_noeeprom(void) { led_matrix_decrease_speed_helper(false); }
+void led_matrix_decrease_speed(void) { led_matrix_decrease_speed_helper(true); }
+
+led_flags_t led_matrix_get_flags(void) { return led_matrix_eeconfig.flags; }
 
-void backlight_set(uint8_t val) { led_matrix_set_value(val); }
+void led_matrix_set_flags(led_flags_t flags) { led_matrix_eeconfig.flags = flags; }
diff --git a/quantum/led_matrix.h b/quantum/led_matrix.h
index 85bae43c1..0984de73b 100644
--- a/quantum/led_matrix.h
+++ b/quantum/led_matrix.h
@@ -19,61 +19,120 @@
 
 #pragma once
 
+#include <stdint.h>
+#include <stdbool.h>
 #include "led_matrix_types.h"
+#include "quantum.h"
 
-#ifndef BACKLIGHT_ENABLE
-#    error You must define BACKLIGHT_ENABLE with LED_MATRIX_ENABLE
+#ifdef IS31FL3731
+#    include "is31fl3731-simple.h"
 #endif
 
+#ifndef LED_MATRIX_LED_FLUSH_LIMIT
+#    define LED_MATRIX_LED_FLUSH_LIMIT 16
+#endif
+
+#ifndef LED_MATRIX_LED_PROCESS_LIMIT
+#    define LED_MATRIX_LED_PROCESS_LIMIT (DRIVER_LED_TOTAL + 4) / 5
+#endif
+
+#if defined(LED_MATRIX_LED_PROCESS_LIMIT) && LED_MATRIX_LED_PROCESS_LIMIT > 0 && LED_MATRIX_LED_PROCESS_LIMIT < DRIVER_LED_TOTAL
+#    define LED_MATRIX_USE_LIMITS(min, max)                        \
+        uint8_t min = LED_MATRIX_LED_PROCESS_LIMIT * params->iter; \
+        uint8_t max = min + LED_MATRIX_LED_PROCESS_LIMIT;          \
+        if (max > DRIVER_LED_TOTAL) max = DRIVER_LED_TOTAL;
+#else
+#    define LED_MATRIX_USE_LIMITS(min, max) \
+        uint8_t min = 0;                    \
+        uint8_t max = DRIVER_LED_TOTAL;
+#endif
+
+#define LED_MATRIX_TEST_LED_FLAGS() \
+    if (!HAS_ANY_FLAGS(g_led_config.flags[i], params->flags)) continue
+
 enum led_matrix_effects {
-    LED_MATRIX_UNIFORM_BRIGHTNESS = 1,
-    // All new effects go above this line
+    LED_MATRIX_NONE = 0,
+
+// --------------------------------------
+// -----Begin led effect enum macros-----
+#define LED_MATRIX_EFFECT(name, ...) LED_MATRIX_##name,
+#include "led_matrix_animations/led_matrix_effects.inc"
+#undef LED_MATRIX_EFFECT
+
+#if defined(LED_MATRIX_CUSTOM_KB) || defined(LED_MATRIX_CUSTOM_USER)
+#    define LED_MATRIX_EFFECT(name, ...) LED_MATRIX_CUSTOM_##name,
+#    ifdef LED_MATRIX_CUSTOM_KB
+#        include "led_matrix_kb.inc"
+#    endif
+#    ifdef LED_MATRIX_CUSTOM_USER
+#        include "led_matrix_user.inc"
+#    endif
+#    undef LED_MATRIX_EFFECT
+#endif
+    // --------------------------------------
+    // -----End led effect enum macros-------
+
     LED_MATRIX_EFFECT_MAX
 };
 
-void led_matrix_set_index_value(int index, uint8_t value);
-void led_matrix_set_index_value_all(uint8_t value);
+void eeconfig_update_led_matrix_default(void);
+void eeconfig_update_led_matrix(void);
+void eeconfig_debug_led_matrix(void);
+
+uint8_t led_matrix_map_row_column_to_led_kb(uint8_t row, uint8_t column, uint8_t *led_i);
+uint8_t led_matrix_map_row_column_to_led(uint8_t row, uint8_t column, uint8_t *led_i);
+
+void led_matrix_set_value(int index, uint8_t value);
+void led_matrix_set_value_all(uint8_t value);
+
+void process_led_matrix(uint8_t row, uint8_t col, bool pressed);
+
+void led_matrix_task(void);
 
 // This runs after another backlight effect and replaces
-// colors already set
+// values already set
 void led_matrix_indicators(void);
 void led_matrix_indicators_kb(void);
 void led_matrix_indicators_user(void);
 
-void led_matrix_init(void);
-void led_matrix_setup_drivers(void);
-
-void led_matrix_set_suspend_state(bool state);
-void led_matrix_set_indicator_state(uint8_t state);
+void led_matrix_indicators_advanced(effect_params_t *params);
+void led_matrix_indicators_advanced_kb(uint8_t led_min, uint8_t led_max);
+void led_matrix_indicators_advanced_user(uint8_t led_min, uint8_t led_max);
 
-void led_matrix_task(void);
+void led_matrix_init(void);
 
-// This should not be called from an interrupt
-// (eg. from a timer interrupt).
-// Call this while idle (in between matrix scans).
-// If the buffer is dirty, it will update the driver with the buffer.
-void led_matrix_update_pwm_buffers(void);
-
-bool process_led_matrix(uint16_t keycode, keyrecord_t *record);
-
-uint32_t led_matrix_get_tick(void);
-
-void    led_matrix_toggle(void);
-void    led_matrix_enable(void);
-void    led_matrix_enable_noeeprom(void);
-void    led_matrix_disable(void);
-void    led_matrix_disable_noeeprom(void);
-void    led_matrix_step(void);
-void    led_matrix_step_reverse(void);
-void    led_matrix_increase_val(void);
-void    led_matrix_decrease_val(void);
-void    led_matrix_increase_speed(void);
-void    led_matrix_decrease_speed(void);
-void    led_matrix_mode(uint8_t mode, bool eeprom_write);
-void    led_matrix_mode_noeeprom(uint8_t mode);
-uint8_t led_matrix_get_mode(void);
-void    led_matrix_set_value(uint8_t mode);
-void    led_matrix_set_value_noeeprom(uint8_t mode);
+void        led_matrix_set_suspend_state(bool state);
+bool        led_matrix_get_suspend_state(void);
+void        led_matrix_toggle(void);
+void        led_matrix_toggle_noeeprom(void);
+void        led_matrix_enable(void);
+void        led_matrix_enable_noeeprom(void);
+void        led_matrix_disable(void);
+void        led_matrix_disable_noeeprom(void);
+uint8_t     led_matrix_is_enabled(void);
+void        led_matrix_mode(uint8_t mode);
+void        led_matrix_mode_noeeprom(uint8_t mode);
+uint8_t     led_matrix_get_mode(void);
+void        led_matrix_step(void);
+void        led_matrix_step_noeeprom(void);
+void        led_matrix_step_reverse(void);
+void        led_matrix_step_reverse_noeeprom(void);
+void        led_matrix_set_val(uint8_t val);
+void        led_matrix_set_val_noeeprom(uint8_t val);
+uint8_t     led_matrix_get_val(void);
+void        led_matrix_increase_val(void);
+void        led_matrix_increase_val_noeeprom(void);
+void        led_matrix_decrease_val(void);
+void        led_matrix_decrease_val_noeeprom(void);
+void        led_matrix_set_speed(uint8_t speed);
+void        led_matrix_set_speed_noeeprom(uint8_t speed);
+uint8_t     led_matrix_get_speed(void);
+void        led_matrix_increase_speed(void);
+void        led_matrix_increase_speed_noeeprom(void);
+void        led_matrix_decrease_speed(void);
+void        led_matrix_decrease_speed_noeeprom(void);
+led_flags_t led_matrix_get_flags(void);
+void        led_matrix_set_flags(led_flags_t flags);
 
 typedef struct {
     /* Perform any initialisation required for the other driver functions to work. */
@@ -91,4 +150,11 @@ extern const led_matrix_driver_t led_matrix_driver;
 
 extern led_eeconfig_t led_matrix_eeconfig;
 
+extern uint32_t     g_led_timer;
 extern led_config_t g_led_config;
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+extern last_hit_t g_last_hit_tracker;
+#endif
+#ifdef LED_MATRIX_FRAMEBUFFER_EFFECTS
+extern uint8_t g_led_frame_buffer[MATRIX_ROWS][MATRIX_COLS];
+#endif
diff --git a/quantum/led_matrix_animations/alpha_mods_anim.h b/quantum/led_matrix_animations/alpha_mods_anim.h
new file mode 100644
index 000000000..6f69f6892
--- /dev/null
+++ b/quantum/led_matrix_animations/alpha_mods_anim.h
@@ -0,0 +1,24 @@
+#ifndef DISABLE_LED_MATRIX_ALPHAS_MODS
+LED_MATRIX_EFFECT(ALPHAS_MODS)
+#    ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+// alphas = val1, mods = val2
+bool ALPHAS_MODS(effect_params_t* params) {
+    LED_MATRIX_USE_LIMITS(led_min, led_max);
+
+    uint8_t val1 = led_matrix_eeconfig.val;
+    uint8_t val2 = val1 + led_matrix_eeconfig.speed;
+
+    for (uint8_t i = led_min; i < led_max; i++) {
+        LED_MATRIX_TEST_LED_FLAGS();
+        if (HAS_FLAGS(g_led_config.flags[i], LED_FLAG_MODIFIER)) {
+            led_matrix_set_value(i, val2);
+        } else {
+            led_matrix_set_value(i, val1);
+        }
+    }
+    return led_max < DRIVER_LED_TOTAL;
+}
+
+#    endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif  // DISABLE_LED_MATRIX_ALPHAS_MODS
diff --git a/quantum/led_matrix_animations/band_anim.h b/quantum/led_matrix_animations/band_anim.h
new file mode 100644
index 000000000..523dba1b7
--- /dev/null
+++ b/quantum/led_matrix_animations/band_anim.h
@@ -0,0 +1,13 @@
+#ifndef DISABLE_LED_MATRIX_BAND
+LED_MATRIX_EFFECT(BAND)
+#    ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t BAND_math(uint8_t val, uint8_t i, uint8_t time) {
+    int16_t v = val - abs(scale8(g_led_config.point[i].x, 228) + 28 - time) * 8;
+    return scale8(v < 0 ? 0 : v, val);
+}
+
+bool BAND(effect_params_t* params) { return effect_runner_i(params, &BAND_math); }
+
+#    endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif  // DISABLE_LED_MATRIX_BAND
diff --git a/quantum/led_matrix_animations/band_pinwheel_anim.h b/quantum/led_matrix_animations/band_pinwheel_anim.h
new file mode 100644
index 000000000..fb3b835ca
--- /dev/null
+++ b/quantum/led_matrix_animations/band_pinwheel_anim.h
@@ -0,0 +1,10 @@
+#ifndef DISABLE_LED_MATRIX_BAND_PINWHEEL
+LED_MATRIX_EFFECT(BAND_PINWHEEL)
+#    ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t BAND_PINWHEEL_math(uint8_t val, int16_t dx, int16_t dy, uint8_t time) { return scale8(val - time - atan2_8(dy, dx) * 3, val); }
+
+bool BAND_PINWHEEL(effect_params_t* params) { return effect_runner_dx_dy(params, &BAND_PINWHEEL_math); }
+
+#    endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif  // DISABLE_LED_MATRIX_BAND_PINWHEEL
diff --git a/quantum/led_matrix_animations/band_spiral_anim.h b/quantum/led_matrix_animations/band_spiral_anim.h
new file mode 100644
index 000000000..fca22aad9
--- /dev/null
+++ b/quantum/led_matrix_animations/band_spiral_anim.h
@@ -0,0 +1,10 @@
+#ifndef DISABLE_LED_MATRIX_BAND_SPIRAL
+LED_MATRIX_EFFECT(BAND_SPIRAL)
+#    ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t BAND_SPIRAL_math(uint8_t val, int16_t dx, int16_t dy, uint8_t dist, uint8_t time) { return scale8(val + dist - time - atan2_8(dy, dx), val); }
+
+bool BAND_SPIRAL(effect_params_t* params) { return effect_runner_dx_dy_dist(params, &BAND_SPIRAL_math); }
+
+#    endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif  // DISABLE_LED_MATRIX_BAND_SPIRAL
diff --git a/quantum/led_matrix_animations/breathing_anim.h b/quantum/led_matrix_animations/breathing_anim.h
new file mode 100644
index 000000000..00310e3f6
--- /dev/null
+++ b/quantum/led_matrix_animations/breathing_anim.h
@@ -0,0 +1,19 @@
+#ifndef DISABLE_LED_MATRIX_BREATHING
+LED_MATRIX_EFFECT(BREATHING)
+#    ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+bool BREATHING(effect_params_t* params) {
+    LED_MATRIX_USE_LIMITS(led_min, led_max);
+
+    uint8_t  val  = led_matrix_eeconfig.val;
+    uint16_t time = scale16by8(g_led_timer, led_matrix_eeconfig.speed / 8);
+    val           = scale8(abs8(sin8(time) - 128) * 2, val);
+    for (uint8_t i = led_min; i < led_max; i++) {
+        LED_MATRIX_TEST_LED_FLAGS();
+        led_matrix_set_value(i, val);
+    }
+    return led_max < DRIVER_LED_TOTAL;
+}
+
+#    endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif  // DISABLE_LED_MATRIX_BREATHING
diff --git a/quantum/led_matrix_animations/cycle_left_right_anim.h b/quantum/led_matrix_animations/cycle_left_right_anim.h
new file mode 100644
index 000000000..51e81d57c
--- /dev/null
+++ b/quantum/led_matrix_animations/cycle_left_right_anim.h
@@ -0,0 +1,10 @@
+#ifndef DISABLE_LED_MATRIX_CYCLE_LEFT_RIGHT
+LED_MATRIX_EFFECT(CYCLE_LEFT_RIGHT)
+#    ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t CYCLE_LEFT_RIGHT_math(uint8_t val, uint8_t i, uint8_t time) { return scale8(g_led_config.point[i].x - time, val); }
+
+bool CYCLE_LEFT_RIGHT(effect_params_t* params) { return effect_runner_i(params, &CYCLE_LEFT_RIGHT_math); }
+
+#    endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif  // DISABLE_LED_MATRIX_CYCLE_LEFT_RIGHT
diff --git a/quantum/led_matrix_animations/cycle_out_in_anim.h b/quantum/led_matrix_animations/cycle_out_in_anim.h
new file mode 100644
index 000000000..f62061552
--- /dev/null
+++ b/quantum/led_matrix_animations/cycle_out_in_anim.h
@@ -0,0 +1,10 @@
+#ifndef DISABLE_LED_MATRIX_CYCLE_OUT_IN
+LED_MATRIX_EFFECT(CYCLE_OUT_IN)
+#    ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t CYCLE_OUT_IN_math(uint8_t val, int16_t dx, int16_t dy, uint8_t dist, uint8_t time) { return scale8(3 * dist / 2 + time, val); }
+
+bool CYCLE_OUT_IN(effect_params_t* params) { return effect_runner_dx_dy_dist(params, &CYCLE_OUT_IN_math); }
+
+#    endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif  // DISABLE_LED_MATRIX_CYCLE_OUT_IN
diff --git a/quantum/led_matrix_animations/cycle_up_down_anim.h b/quantum/led_matrix_animations/cycle_up_down_anim.h
new file mode 100644
index 000000000..bd1d12567
--- /dev/null
+++ b/quantum/led_matrix_animations/cycle_up_down_anim.h
@@ -0,0 +1,10 @@
+#ifndef DISABLE_LED_MATRIX_CYCLE_UP_DOWN
+LED_MATRIX_EFFECT(CYCLE_UP_DOWN)
+#    ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t CYCLE_UP_DOWN_math(uint8_t val, uint8_t i, uint8_t time) { return scale8(g_led_config.point[i].y - time, val); }
+
+bool CYCLE_UP_DOWN(effect_params_t* params) { return effect_runner_i(params, &CYCLE_UP_DOWN_math); }
+
+#    endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif  // DISABLE_LED_MATRIX_CYCLE_UP_DOWN
diff --git a/quantum/led_matrix_animations/dual_beacon_anim.h b/quantum/led_matrix_animations/dual_beacon_anim.h
new file mode 100644
index 000000000..9b8a7877c
--- /dev/null
+++ b/quantum/led_matrix_animations/dual_beacon_anim.h
@@ -0,0 +1,10 @@
+#ifndef DISABLE_LED_MATRIX_DUAL_BEACON
+LED_MATRIX_EFFECT(DUAL_BEACON)
+#    ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t DUAL_BEACON_math(uint8_t val, int8_t sin, int8_t cos, uint8_t i, uint8_t time) { return scale8(((g_led_config.point[i].y - k_led_matrix_center.y) * cos + (g_led_config.point[i].x - k_led_matrix_center.x) * sin) / 128, val); }
+
+bool DUAL_BEACON(effect_params_t* params) { return effect_runner_sin_cos_i(params, &DUAL_BEACON_math); }
+
+#    endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif  // DISABLE_LED_MATRIX_DUAL_BEACON
diff --git a/quantum/led_matrix_animations/led_matrix_effects.inc b/quantum/led_matrix_animations/led_matrix_effects.inc
new file mode 100644
index 000000000..67237c568
--- /dev/null
+++ b/quantum/led_matrix_animations/led_matrix_effects.inc
@@ -0,0 +1,18 @@
+// Add your new core led matrix effect here, order determins enum order, requires "led_matrix_animations/ directory
+#include "led_matrix_animations/solid_anim.h"
+#include "led_matrix_animations/alpha_mods_anim.h"
+#include "led_matrix_animations/breathing_anim.h"
+#include "led_matrix_animations/band_anim.h"
+#include "led_matrix_animations/band_pinwheel_anim.h"
+#include "led_matrix_animations/band_spiral_anim.h"
+#include "led_matrix_animations/cycle_left_right_anim.h"
+#include "led_matrix_animations/cycle_up_down_anim.h"
+#include "led_matrix_animations/cycle_out_in_anim.h"
+#include "led_matrix_animations/dual_beacon_anim.h"
+#include "led_matrix_animations/solid_reactive_simple_anim.h"
+#include "led_matrix_animations/solid_reactive_wide.h"
+#include "led_matrix_animations/solid_reactive_cross.h"
+#include "led_matrix_animations/solid_reactive_nexus.h"
+#include "led_matrix_animations/solid_splash_anim.h"
+#include "led_matrix_animations/wave_left_right_anim.h"
+#include "led_matrix_animations/wave_up_down_anim.h"
diff --git a/quantum/led_matrix_animations/solid_anim.h b/quantum/led_matrix_animations/solid_anim.h
new file mode 100644
index 000000000..4c9e43c58
--- /dev/null
+++ b/quantum/led_matrix_animations/solid_anim.h
@@ -0,0 +1,15 @@
+LED_MATRIX_EFFECT(SOLID)
+#ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+bool SOLID(effect_params_t* params) {
+    LED_MATRIX_USE_LIMITS(led_min, led_max);
+
+    uint8_t val = led_matrix_eeconfig.val;
+    for (uint8_t i = led_min; i < led_max; i++) {
+        LED_MATRIX_TEST_LED_FLAGS();
+        led_matrix_set_value(i, val);
+    }
+    return led_max < DRIVER_LED_TOTAL;
+}
+
+#endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
diff --git a/quantum/led_matrix_animations/solid_reactive_cross.h b/quantum/led_matrix_animations/solid_reactive_cross.h
new file mode 100644
index 000000000..f402d99b3
--- /dev/null
+++ b/quantum/led_matrix_animations/solid_reactive_cross.h
@@ -0,0 +1,35 @@
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+#    if !defined(DISABLE_LED_MATRIX_SOLID_REACTIVE_CROSS) || !defined(DISABLE_LED_MATRIX_SOLID_REACTIVE_MULTICROSS)
+
+#        ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_CROSS
+LED_MATRIX_EFFECT(SOLID_REACTIVE_CROSS)
+#        endif
+
+#        ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_MULTICROSS
+LED_MATRIX_EFFECT(SOLID_REACTIVE_MULTICROSS)
+#        endif
+
+#        ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t SOLID_REACTIVE_CROSS_math(uint8_t val, int16_t dx, int16_t dy, uint8_t dist, uint16_t tick) {
+    uint16_t effect = tick + dist;
+    dx              = dx < 0 ? dx * -1 : dx;
+    dy              = dy < 0 ? dy * -1 : dy;
+    dx              = dx * 16 > 255 ? 255 : dx * 16;
+    dy              = dy * 16 > 255 ? 255 : dy * 16;
+    effect += dx > dy ? dy : dx;
+    if (effect > 255) effect = 255;
+    return qadd8(val, 255 - effect);
+}
+
+#            ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_CROSS
+bool SOLID_REACTIVE_CROSS(effect_params_t* params) { return effect_runner_reactive_splash(qsub8(g_last_hit_tracker.count, 1), params, &SOLID_REACTIVE_CROSS_math); }
+#            endif
+
+#            ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_MULTICROSS
+bool SOLID_REACTIVE_MULTICROSS(effect_params_t* params) { return effect_runner_reactive_splash(0, params, &SOLID_REACTIVE_CROSS_math); }
+#            endif
+
+#        endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#    endif  // !defined(DISABLE_LED_MATRIX_SOLID_REACTIVE_CROSS) || !defined(DISABLE_LED_MATRIX_SOLID_REACTIVE_MULTICROSS)
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
diff --git a/quantum/led_matrix_animations/solid_reactive_nexus.h b/quantum/led_matrix_animations/solid_reactive_nexus.h
new file mode 100644
index 000000000..4d0d25226
--- /dev/null
+++ b/quantum/led_matrix_animations/solid_reactive_nexus.h
@@ -0,0 +1,32 @@
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+#    if !defined(DISABLE_LED_MATRIX_SOLID_REACTIVE_NEXUS) || !defined(DISABLE_LED_MATRIX_SOLID_REACTIVE_MULTINEXUS)
+
+#        ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_NEXUS
+LED_MATRIX_EFFECT(SOLID_REACTIVE_NEXUS)
+#        endif
+
+#        ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_MULTINEXUS
+LED_MATRIX_EFFECT(SOLID_REACTIVE_MULTINEXUS)
+#        endif
+
+#        ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t SOLID_REACTIVE_NEXUS_math(uint8_t val, int16_t dx, int16_t dy, uint8_t dist, uint16_t tick) {
+    uint16_t effect = tick - dist;
+    if (effect > 255) effect = 255;
+    if (dist > 72) effect = 255;
+    if ((dx > 8 || dx < -8) && (dy > 8 || dy < -8)) effect = 255;
+    return qadd8(val, 255 - effect);
+}
+
+#            ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_NEXUS
+bool SOLID_REACTIVE_NEXUS(effect_params_t* params) { return effect_runner_reactive_splash(qsub8(g_last_hit_tracker.count, 1), params, &SOLID_REACTIVE_NEXUS_math); }
+#            endif
+
+#            ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_MULTINEXUS
+bool SOLID_REACTIVE_MULTINEXUS(effect_params_t* params) { return effect_runner_reactive_splash(0, params, &SOLID_REACTIVE_NEXUS_math); }
+#            endif
+
+#        endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#    endif  // !defined(DISABLE_LED_MATRIX_SOLID_REACTIVE_NEXUS) || !defined(DISABLE_LED_MATRIX_SOLID_REACTIVE_MULTINEXUS)
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
diff --git a/quantum/led_matrix_animations/solid_reactive_simple_anim.h b/quantum/led_matrix_animations/solid_reactive_simple_anim.h
new file mode 100644
index 000000000..30e2527f6
--- /dev/null
+++ b/quantum/led_matrix_animations/solid_reactive_simple_anim.h
@@ -0,0 +1,12 @@
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+#    ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_SIMPLE
+LED_MATRIX_EFFECT(SOLID_REACTIVE_SIMPLE)
+#        ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t SOLID_REACTIVE_SIMPLE_math(uint8_t val, uint16_t offset) { return scale8(255 - offset, val); }
+
+bool SOLID_REACTIVE_SIMPLE(effect_params_t* params) { return effect_runner_reactive(params, &SOLID_REACTIVE_SIMPLE_math); }
+
+#        endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#    endif  // DISABLE_LED_MATRIX_SOLID_REACTIVE_SIMPLE
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
diff --git a/quantum/led_matrix_animations/solid_reactive_wide.h b/quantum/led_matrix_animations/solid_reactive_wide.h
new file mode 100644
index 000000000..34a230c25
--- /dev/null
+++ b/quantum/led_matrix_animations/solid_reactive_wide.h
@@ -0,0 +1,30 @@
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+#    if !defined(DISABLE_LED_MATRIX_SOLID_REACTIVE_WIDE) || !defined(DISABLE_LED_MATRIX_SOLID_REACTIVE_MULTIWIDE)
+
+#        ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_WIDE
+LED_MATRIX_EFFECT(SOLID_REACTIVE_WIDE)
+#        endif
+
+#        ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_MULTIWIDE
+LED_MATRIX_EFFECT(SOLID_REACTIVE_MULTIWIDE)
+#        endif
+
+#        ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t SOLID_REACTIVE_WIDE_math(uint8_t val, int16_t dx, int16_t dy, uint8_t dist, uint16_t tick) {
+    uint16_t effect = tick + dist * 5;
+    if (effect > 255) effect = 255;
+    return qadd8(val, 255 - effect);
+}
+
+#            ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_WIDE
+bool SOLID_REACTIVE_WIDE(effect_params_t* params) { return effect_runner_reactive_splash(qsub8(g_last_hit_tracker.count, 1), params, &SOLID_REACTIVE_WIDE_math); }
+#            endif
+
+#            ifndef DISABLE_LED_MATRIX_SOLID_REACTIVE_MULTIWIDE
+bool SOLID_REACTIVE_MULTIWIDE(effect_params_t* params) { return effect_runner_reactive_splash(0, params, &SOLID_REACTIVE_WIDE_math); }
+#            endif
+
+#        endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#    endif  // !defined(DISABLE_LED_MATRIX_SOLID_REACTIVE_WIDE) || !defined(DISABLE_LED_MATRIX_SOLID_REACTIVE_MULTIWIDE)
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
diff --git a/quantum/led_matrix_animations/solid_splash_anim.h b/quantum/led_matrix_animations/solid_splash_anim.h
new file mode 100644
index 000000000..4f6ba3d34
--- /dev/null
+++ b/quantum/led_matrix_animations/solid_splash_anim.h
@@ -0,0 +1,30 @@
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+#    if !defined(DISABLE_LED_MATRIX_SOLID_SPLASH) || !defined(DISABLE_LED_MATRIX_SOLID_MULTISPLASH)
+
+#        ifndef DISABLE_LED_MATRIX_SOLID_SPLASH
+LED_MATRIX_EFFECT(SOLID_SPLASH)
+#        endif
+
+#        ifndef DISABLE_LED_MATRIX_SOLID_MULTISPLASH
+LED_MATRIX_EFFECT(SOLID_MULTISPLASH)
+#        endif
+
+#        ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+uint8_t SOLID_SPLASH_math(uint8_t val, int16_t dx, int16_t dy, uint8_t dist, uint16_t tick) {
+    uint16_t effect = tick - dist;
+    if (effect > 255) effect = 255;
+    return qadd8(val, 255 - effect);
+}
+
+#            ifndef DISABLE_LED_MATRIX_SOLID_SPLASH
+bool SOLID_SPLASH(effect_params_t* params) { return effect_runner_reactive_splash(qsub8(g_last_hit_tracker.count, 1), params, &SOLID_SPLASH_math); }
+#            endif
+
+#            ifndef DISABLE_LED_MATRIX_SOLID_MULTISPLASH
+bool SOLID_MULTISPLASH(effect_params_t* params) { return effect_runner_reactive_splash(0, params, &SOLID_SPLASH_math); }
+#            endif
+
+#        endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#    endif  // !defined(DISABLE_LED_MATRIX_SPLASH) && !defined(DISABLE_LED_MATRIX_MULTISPLASH)
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
diff --git a/quantum/led_matrix_animations/wave_left_right_anim.h b/quantum/led_matrix_animations/wave_left_right_anim.h
new file mode 100644
index 000000000..736f22ddc
--- /dev/null
+++ b/quantum/led_matrix_animations/wave_left_right_anim.h
@@ -0,0 +1,10 @@
+#ifndef DISABLE_LED_MATRIX_WAVE_LEFT_RIGHT
+LED_MATRIX_EFFECT(WAVE_LEFT_RIGHT)
+#    ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t WAVE_LEFT_RIGHT_math(uint8_t val, uint8_t i, uint8_t time) { return scale8(sin8(g_led_config.point[i].x - time), val); }
+
+bool WAVE_LEFT_RIGHT(effect_params_t* params) { return effect_runner_i(params, &WAVE_LEFT_RIGHT_math); }
+
+#    endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif  // DISABLE_LED_MATRIX_WAVE_LEFT_RIGHT
diff --git a/quantum/led_matrix_animations/wave_up_down_anim.h b/quantum/led_matrix_animations/wave_up_down_anim.h
new file mode 100644
index 000000000..3cab0597d
--- /dev/null
+++ b/quantum/led_matrix_animations/wave_up_down_anim.h
@@ -0,0 +1,10 @@
+#ifndef DISABLE_LED_MATRIX_WAVE_UP_DOWN
+LED_MATRIX_EFFECT(WAVE_UP_DOWN)
+#    ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS
+
+static uint8_t WAVE_UP_DOWN_math(uint8_t val, uint8_t i, uint8_t time) { return scale8(sin8(g_led_config.point[i].y - time), val); }
+
+bool WAVE_UP_DOWN(effect_params_t* params) { return effect_runner_i(params, &WAVE_UP_DOWN_math); }
+
+#    endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif  // DISABLE_LED_MATRIX_WAVE_UP_DOWN
diff --git a/quantum/led_matrix_drivers.c b/quantum/led_matrix_drivers.c
index eddf3f286..1d46b2c50 100644
--- a/quantum/led_matrix_drivers.c
+++ b/quantum/led_matrix_drivers.c
@@ -15,9 +15,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <stdint.h>
-#include <stdbool.h>
-#include "quantum.h"
 #include "led_matrix.h"
 
 /* Each driver needs to define a struct:
@@ -30,10 +27,6 @@
 
 #if defined(IS31FL3731) || defined(IS31FL3733)
 
-#    if defined(IS31FL3731)
-#        include "is31fl3731-simple.h"
-#    endif
-
 #    include "i2c_master.h"
 
 static void init(void) {
@@ -53,16 +46,28 @@ static void init(void) {
 #        endif
 #    else
 #        ifdef LED_DRIVER_ADDR_1
-    IS31FL3733_init(LED_DRIVER_ADDR_1, 0);
+#            ifndef LED_DRIVER_SYNC_1
+#                define LED_DRIVER_SYNC_1 0
+#            endif
+    IS31FL3733_init(LED_DRIVER_ADDR_1, LED_DRIVER_SYNC_1);
 #        endif
 #        ifdef LED_DRIVER_ADDR_2
-    IS31FL3733_init(LED_DRIVER_ADDR_2, 0);
+#            ifndef LED_DRIVER_SYNC_2
+#                define LED_DRIVER_SYNC_2 0
+#            endif
+    IS31FL3733_init(LED_DRIVER_ADDR_2, LED_DRIVER_SYNC_2);
 #        endif
 #        ifdef LED_DRIVER_ADDR_3
-    IS31FL3733_init(LED_DRIVER_ADDR_3, 0);
+#            ifndef LED_DRIVER_SYNC_3
+#                define LED_DRIVER_SYNC_3 0
+#            endif
+    IS31FL3733_init(LED_DRIVER_ADDR_3, LED_DRIVER_SYNC_3);
 #        endif
 #        ifdef LED_DRIVER_ADDR_4
-    IS31FL3733_init(LED_DRIVER_ADDR_4, 0);
+#            ifndef LED_DRIVER_SYNC_4
+#                define LED_DRIVER_SYNC_4 0
+#            endif
+    IS31FL3733_init(LED_DRIVER_ADDR_4, LED_DRIVER_SYNC_4);
 #        endif
 #    endif
 
diff --git a/quantum/led_matrix_runners/effect_runner_dx_dy.h b/quantum/led_matrix_runners/effect_runner_dx_dy.h
new file mode 100644
index 000000000..ef97631b9
--- /dev/null
+++ b/quantum/led_matrix_runners/effect_runner_dx_dy.h
@@ -0,0 +1,16 @@
+#pragma once
+
+typedef uint8_t (*dx_dy_f)(uint8_t val, int16_t dx, int16_t dy, uint8_t time);
+
+bool effect_runner_dx_dy(effect_params_t* params, dx_dy_f effect_func) {
+    LED_MATRIX_USE_LIMITS(led_min, led_max);
+
+    uint8_t time = scale16by8(g_led_timer, led_matrix_eeconfig.speed / 2);
+    for (uint8_t i = led_min; i < led_max; i++) {
+        LED_MATRIX_TEST_LED_FLAGS();
+        int16_t dx = g_led_config.point[i].x - k_led_matrix_center.x;
+        int16_t dy = g_led_config.point[i].y - k_led_matrix_center.y;
+        led_matrix_set_value(i, effect_func(led_matrix_eeconfig.val, dx, dy, time));
+    }
+    return led_max < DRIVER_LED_TOTAL;
+}
diff --git a/quantum/led_matrix_runners/effect_runner_dx_dy_dist.h b/quantum/led_matrix_runners/effect_runner_dx_dy_dist.h
new file mode 100644
index 000000000..5ef5938be
--- /dev/null
+++ b/quantum/led_matrix_runners/effect_runner_dx_dy_dist.h
@@ -0,0 +1,17 @@
+#pragma once
+
+typedef uint8_t (*dx_dy_dist_f)(uint8_t val, int16_t dx, int16_t dy, uint8_t dist, uint8_t time);
+
+bool effect_runner_dx_dy_dist(effect_params_t* params, dx_dy_dist_f effect_func) {
+    LED_MATRIX_USE_LIMITS(led_min, led_max);
+
+    uint8_t time = scale16by8(g_led_timer, led_matrix_eeconfig.speed / 2);
+    for (uint8_t i = led_min; i < led_max; i++) {
+        LED_MATRIX_TEST_LED_FLAGS();
+        int16_t dx   = g_led_config.point[i].x - k_led_matrix_center.x;
+        int16_t dy   = g_led_config.point[i].y - k_led_matrix_center.y;
+        uint8_t dist = sqrt16(dx * dx + dy * dy);
+        led_matrix_set_value(i, effect_func(led_matrix_eeconfig.val, dx, dy, dist, time));
+    }
+    return led_max < DRIVER_LED_TOTAL;
+}
diff --git a/quantum/led_matrix_runners/effect_runner_i.h b/quantum/led_matrix_runners/effect_runner_i.h
new file mode 100644
index 000000000..b3015759b
--- /dev/null
+++ b/quantum/led_matrix_runners/effect_runner_i.h
@@ -0,0 +1,14 @@
+#pragma once
+
+typedef uint8_t (*i_f)(uint8_t val, uint8_t i, uint8_t time);
+
+bool effect_runner_i(effect_params_t* params, i_f effect_func) {
+    LED_MATRIX_USE_LIMITS(led_min, led_max);
+
+    uint8_t time = scale16by8(g_led_timer, led_matrix_eeconfig.speed / 4);
+    for (uint8_t i = led_min; i < led_max; i++) {
+        LED_MATRIX_TEST_LED_FLAGS();
+        led_matrix_set_value(i, effect_func(led_matrix_eeconfig.val, i, time));
+    }
+    return led_max < DRIVER_LED_TOTAL;
+}
diff --git a/quantum/led_matrix_runners/effect_runner_reactive.h b/quantum/led_matrix_runners/effect_runner_reactive.h
new file mode 100644
index 000000000..4369ea8c4
--- /dev/null
+++ b/quantum/led_matrix_runners/effect_runner_reactive.h
@@ -0,0 +1,28 @@
+#pragma once
+
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+
+typedef uint8_t (*reactive_f)(uint8_t val, uint16_t offset);
+
+bool effect_runner_reactive(effect_params_t* params, reactive_f effect_func) {
+    LED_MATRIX_USE_LIMITS(led_min, led_max);
+
+    uint16_t max_tick = 65535 / led_matrix_eeconfig.speed;
+    for (uint8_t i = led_min; i < led_max; i++) {
+        LED_MATRIX_TEST_LED_FLAGS();
+        uint16_t tick = max_tick;
+        // Reverse search to find most recent key hit
+        for (int8_t j = g_last_hit_tracker.count - 1; j >= 0; j--) {
+            if (g_last_hit_tracker.index[j] == i && g_last_hit_tracker.tick[j] < tick) {
+                tick = g_last_hit_tracker.tick[j];
+                break;
+            }
+        }
+
+        uint16_t offset = scale16by8(tick, led_matrix_eeconfig.speed);
+        led_matrix_set_value(i, effect_func(led_matrix_eeconfig.val, offset));
+    }
+    return led_max < DRIVER_LED_TOTAL;
+}
+
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
diff --git a/quantum/led_matrix_runners/effect_runner_reactive_splash.h b/quantum/led_matrix_runners/effect_runner_reactive_splash.h
new file mode 100644
index 000000000..d6eb9731e
--- /dev/null
+++ b/quantum/led_matrix_runners/effect_runner_reactive_splash.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+
+typedef uint8_t (*reactive_splash_f)(uint8_t val, int16_t dx, int16_t dy, uint8_t dist, uint16_t tick);
+
+bool effect_runner_reactive_splash(uint8_t start, effect_params_t* params, reactive_splash_f effect_func) {
+    LED_MATRIX_USE_LIMITS(led_min, led_max);
+
+    uint8_t count = g_last_hit_tracker.count;
+    for (uint8_t i = led_min; i < led_max; i++) {
+        LED_MATRIX_TEST_LED_FLAGS();
+        uint8_t val = 0;
+        for (uint8_t j = start; j < count; j++) {
+            int16_t  dx   = g_led_config.point[i].x - g_last_hit_tracker.x[j];
+            int16_t  dy   = g_led_config.point[i].y - g_last_hit_tracker.y[j];
+            uint8_t  dist = sqrt16(dx * dx + dy * dy);
+            uint16_t tick = scale16by8(g_last_hit_tracker.tick[j], led_matrix_eeconfig.speed);
+            val           = effect_func(val, dx, dy, dist, tick);
+        }
+        led_matrix_set_value(i, scale8(val, led_matrix_eeconfig.val));
+    }
+    return led_max < DRIVER_LED_TOTAL;
+}
+
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
diff --git a/quantum/led_matrix_runners/effect_runner_sin_cos_i.h b/quantum/led_matrix_runners/effect_runner_sin_cos_i.h
new file mode 100644
index 000000000..4a5219abd
--- /dev/null
+++ b/quantum/led_matrix_runners/effect_runner_sin_cos_i.h
@@ -0,0 +1,16 @@
+#pragma once
+
+typedef uint8_t (*sin_cos_i_f)(uint8_t val, int8_t sin, int8_t cos, uint8_t i, uint8_t time);
+
+bool effect_runner_sin_cos_i(effect_params_t* params, sin_cos_i_f effect_func) {
+    LED_MATRIX_USE_LIMITS(led_min, led_max);
+
+    uint16_t time      = scale16by8(g_led_timer, led_matrix_eeconfig.speed / 4);
+    int8_t   cos_value = cos8(time) - 128;
+    int8_t   sin_value = sin8(time) - 128;
+    for (uint8_t i = led_min; i < led_max; i++) {
+        LED_MATRIX_TEST_LED_FLAGS();
+        led_matrix_set_value(i, effect_func(led_matrix_eeconfig.val, cos_value, sin_value, i, time));
+    }
+    return led_max < DRIVER_LED_TOTAL;
+}
diff --git a/quantum/led_matrix_types.h b/quantum/led_matrix_types.h
index 669b67042..61cdbd9b8 100644
--- a/quantum/led_matrix_types.h
+++ b/quantum/led_matrix_types.h
@@ -29,15 +29,42 @@
 #    pragma pack(push, 1)
 #endif
 
+#if defined(LED_MATRIX_KEYPRESSES) || defined(LED_MATRIX_KEYRELEASES)
+#    define LED_MATRIX_KEYREACTIVE_ENABLED
+#endif
+
 // Last led hit
 #ifndef LED_HITS_TO_REMEMBER
 #    define LED_HITS_TO_REMEMBER 8
 #endif  // LED_HITS_TO_REMEMBER
 
+#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
+typedef struct PACKED {
+    uint8_t  count;
+    uint8_t  x[LED_HITS_TO_REMEMBER];
+    uint8_t  y[LED_HITS_TO_REMEMBER];
+    uint8_t  index[LED_HITS_TO_REMEMBER];
+    uint16_t tick[LED_HITS_TO_REMEMBER];
+} last_hit_t;
+#endif  // LED_MATRIX_KEYREACTIVE_ENABLED
+
+typedef enum led_task_states { STARTING, RENDERING, FLUSHING, SYNCING } led_task_states;
+
+typedef uint8_t led_flags_t;
+
+typedef struct PACKED {
+    uint8_t     iter;
+    led_flags_t flags;
+    bool        init;
+} effect_params_t;
+
 typedef struct PACKED {
     uint8_t x;
     uint8_t y;
-} point_t;
+} led_point_t;
+
+#define HAS_FLAGS(bits, flags) ((bits & flags) == flags)
+#define HAS_ANY_FLAGS(bits, flags) ((bits & flags) != 0x00)
 
 #define LED_FLAG_ALL 0xFF
 #define LED_FLAG_NONE 0x00
@@ -48,19 +75,20 @@ typedef struct PACKED {
 #define NO_LED 255
 
 typedef struct PACKED {
-    uint8_t matrix_co[MATRIX_ROWS][MATRIX_COLS];
-    point_t point[DRIVER_LED_TOTAL];
-    uint8_t flags[DRIVER_LED_TOTAL];
+    uint8_t     matrix_co[MATRIX_ROWS][MATRIX_COLS];
+    led_point_t point[DRIVER_LED_TOTAL];
+    uint8_t     flags[DRIVER_LED_TOTAL];
 } led_config_t;
 
 typedef union {
     uint32_t raw;
     struct PACKED {
-        uint8_t  enable : 2;
-        uint8_t  mode : 6;
-        uint16_t reserved;
-        uint8_t  val;
-        uint8_t  speed;  // EECONFIG needs to be increased to support this
+        uint8_t     enable : 2;
+        uint8_t     mode : 6;
+        uint16_t    reserved;
+        uint8_t     val;
+        uint8_t     speed;  // EECONFIG needs to be increased to support this
+        led_flags_t flags;
     };
 } led_eeconfig_t;
 
diff --git a/quantum/matrix.c b/quantum/matrix.c
index c027b7bf2..34d6af2e6 100644
--- a/quantum/matrix.c
+++ b/quantum/matrix.c
@@ -116,9 +116,7 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 
     // Unselect row
     unselect_row(current_row);
-    if (current_row + 1 < MATRIX_ROWS) {
-        matrix_output_unselect_delay();  // wait for row signal to go HIGH
-    }
+    matrix_output_unselect_delay();  // wait for all Col signals to go HIGH
 
     // If the row has changed, store the row and return the changed flag.
     if (current_matrix[current_row] != current_row_value) {
@@ -178,9 +176,7 @@ static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
 
     // Unselect col
     unselect_col(current_col);
-    if (current_col + 1 < MATRIX_COLS) {
-        matrix_output_unselect_delay();  // wait for col signal to go HIGH
-    }
+    matrix_output_unselect_delay();  // wait for all Row signals to go HIGH
 
     return matrix_changed;
 }
diff --git a/quantum/matrix.h b/quantum/matrix.h
index ce57010a4..3fe691aae 100644
--- a/quantum/matrix.h
+++ b/quantum/matrix.h
@@ -74,6 +74,11 @@ void matrix_scan_kb(void);
 void matrix_init_user(void);
 void matrix_scan_user(void);
 
+#ifdef SPLIT_KEYBOARD
+void matrix_slave_scan_kb(void);
+void matrix_slave_scan_user(void);
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/quantum/mcu_selection.mk b/quantum/mcu_selection.mk
index f7329fc4d..9268c4522 100644
--- a/quantum/mcu_selection.mk
+++ b/quantum/mcu_selection.mk
@@ -81,6 +81,33 @@ ifneq ($(findstring MK20DX256, $(MCU)),)
   BOARD ?= PJRC_TEENSY_3_1
 endif
 
+ifneq ($(findstring MK66F18, $(MCU)),)
+  # Cortex version
+  MCU = cortex-m4
+
+  # ARM version, CORTEX-M0/M1 are 6, CORTEX-M3/M4/M7 are 7
+  ARMV = 7
+
+  ## chip/board settings
+  # - the next two should match the directories in
+  #   <chibios>/os/hal/ports/$(MCU_FAMILY)/$(MCU_SERIES)
+  MCU_FAMILY = KINETIS
+  MCU_SERIES = MK66F18
+
+  # Linker script to use
+  # - it should exist either in <chibios>/os/common/ports/ARMCMx/compilers/GCC/ld/
+  #   or <keyboard_dir>/ld/
+  MCU_LDSCRIPT ?= MK66FX1M0
+
+  # Startup code to use
+  #  - it should exist in <chibios>/os/common/startup/ARMCMx/compilers/GCC/mk/
+  MCU_STARTUP ?= MK66F18
+
+  # Board: it should exist either in <chibios>/os/hal/boards/,
+  # <keyboard_dir>/boards/, or drivers/boards/
+  BOARD ?= PJRC_TEENSY_3_6
+endif
+
 ifneq ($(findstring STM32F042, $(MCU)),)
   # Cortex version
   MCU = cortex-m0
@@ -112,6 +139,9 @@ ifneq ($(findstring STM32F042, $(MCU)),)
   # Options to pass to dfu-util when flashing
   DFU_ARGS ?= -d 0483:DF11 -a 0 -s 0x08000000:leave
   DFU_SUFFIX_ARGS ?= -v 0483 -p DF11
+
+  # UF2 settings
+  UF2_FAMILY ?= STM32F0
 endif
 
 ifneq ($(findstring STM32F072, $(MCU)),)
@@ -145,6 +175,9 @@ ifneq ($(findstring STM32F072, $(MCU)),)
   # Options to pass to dfu-util when flashing
   DFU_ARGS ?= -d 0483:DF11 -a 0 -s 0x08000000:leave
   DFU_SUFFIX_ARGS ?= -v 0483 -p DF11
+
+  # UF2 settings
+  UF2_FAMILY ?= STM32F0
 endif
 
 ifneq ($(findstring STM32F103, $(MCU)),)
@@ -178,6 +211,9 @@ ifneq ($(findstring STM32F103, $(MCU)),)
   # Options to pass to dfu-util when flashing
   DFU_ARGS ?= -d 0483:DF11 -a 0 -s 0x08000000:leave
   DFU_SUFFIX_ARGS ?= -v 0483 -p DF11
+
+  # UF2 settings
+  UF2_FAMILY ?= STM32F1
 endif
 
 ifneq ($(findstring STM32F303, $(MCU)),)
@@ -211,6 +247,9 @@ ifneq ($(findstring STM32F303, $(MCU)),)
   # Options to pass to dfu-util when flashing
   DFU_ARGS ?= -d 0483:DF11 -a 0 -s 0x08000000:leave
   DFU_SUFFIX_ARGS ?= -v 0483 -p DF11
+
+  # UF2 settings
+  UF2_FAMILY ?= STM32F3
 endif
 
 ifneq ($(findstring STM32F401, $(MCU)),)
@@ -244,6 +283,9 @@ ifneq ($(findstring STM32F401, $(MCU)),)
   # Options to pass to dfu-util when flashing
   DFU_ARGS ?= -d 0483:DF11 -a 0 -s 0x08000000:leave
   DFU_SUFFIX_ARGS ?= -v 0483 -p DF11
+
+  # UF2 settings
+  UF2_FAMILY ?= STM32F4
 endif
 
 ifneq ($(findstring STM32F411, $(MCU)),)
@@ -262,7 +304,12 @@ ifneq ($(findstring STM32F411, $(MCU)),)
   # Linker script to use
   # - it should exist either in <chibios>/os/common/ports/ARMCMx/compilers/GCC/ld/
   #   or <keyboard_dir>/ld/
-  MCU_LDSCRIPT ?= STM32F411xE
+  ifeq ($(strip $(BOOTLOADER)), tinyuf2)
+    MCU_LDSCRIPT ?= STM32F411xE_tinyuf2
+    FIRMWARE_FORMAT ?= uf2
+  else
+    MCU_LDSCRIPT ?= STM32F411xE
+  endif
 
   # Startup code to use
   #  - it should exist in <chibios>/os/common/startup/ARMCMx/compilers/GCC/mk/
@@ -277,6 +324,43 @@ ifneq ($(findstring STM32F411, $(MCU)),)
   # Options to pass to dfu-util when flashing
   DFU_ARGS ?= -d 0483:DF11 -a 0 -s 0x08000000:leave
   DFU_SUFFIX_ARGS ?= -v 0483 -p DF11
+
+  # UF2 settings
+  UF2_FAMILY ?= STM32F4
+endif
+
+ifneq ($(findstring STM32F446, $(MCU)),)
+  # Cortex version
+  MCU = cortex-m4
+
+  # ARM version, CORTEX-M0/M1 are 6, CORTEX-M3/M4/M7 are 7
+  ARMV = 7
+
+  ## chip/board settings
+  # - the next two should match the directories in
+  #   <chibios>/os/hal/ports/$(MCU_FAMILY)/$(MCU_SERIES)
+  MCU_FAMILY = STM32
+  MCU_SERIES = STM32F4xx
+
+  # Linker script to use
+  # - it should exist either in <chibios>/os/common/ports/ARMCMx/compilers/GCC/ld/
+  #   or <chibios>/os/common/startup/ARMCMx/compilers/GCC/ld/
+  #   or <keyboard_dir>/ld/
+  MCU_LDSCRIPT ?= STM32F446xE
+
+  # Startup code to use
+  #  - it should exist in <chibios>/os/common/startup/ARMCMx/compilers/GCC/mk/
+  MCU_STARTUP ?= stm32f4xx
+
+  # Board: it should exist either in <chibios>/os/hal/boards/,
+  # <keyboard_dir>/boards/, or drivers/boards/
+  BOARD ?= GENERIC_STM32_F446XE
+
+  USE_FPU ?= yes
+
+  # Options to pass to dfu-util when flashing
+  DFU_ARGS ?= -d 0483:DF11 -a 0 -s 0x08000000:leave
+  DFU_SUFFIX_ARGS ?= -v 0483 -p DF11
 endif
 
 ifneq ($(findstring STM32G431, $(MCU)),)
@@ -310,6 +394,9 @@ ifneq ($(findstring STM32G431, $(MCU)),)
   # Options to pass to dfu-util when flashing
   DFU_ARGS ?= -d 0483:DF11 -a 0 -s 0x08000000:leave
   DFU_SUFFIX_ARGS ?= -v 0483 -p DF11
+
+  # UF2 settings
+  UF2_FAMILY ?= STM32G4
 endif
 
 ifneq ($(findstring STM32G474, $(MCU)),)
@@ -343,6 +430,47 @@ ifneq ($(findstring STM32G474, $(MCU)),)
   # Options to pass to dfu-util when flashing
   DFU_ARGS ?= -d 0483:DF11 -a 0 -s 0x08000000:leave
   DFU_SUFFIX_ARGS ?= -v 0483 -p DF11
+
+  # UF2 settings
+  UF2_FAMILY ?= STM32G4
+endif
+
+ifneq (,$(filter $(MCU),STM32L433 STM32L443))
+  # Cortex version
+  MCU = cortex-m4
+
+  # ARM version, CORTEX-M0/M1 are 6, CORTEX-M3/M4/M7 are 7
+  ARMV = 7
+
+  ## chip/board settings
+  # - the next two should match the directories in
+  #   <chibios>/os/hal/ports/$(MCU_FAMILY)/$(MCU_SERIES)
+  MCU_FAMILY = STM32
+  MCU_SERIES = STM32L4xx
+
+  # Linker script to use
+  # - it should exist either in <chibios>/os/common/ports/ARMCMx/compilers/GCC/ld/
+  #   or <keyboard_dir>/ld/
+  MCU_LDSCRIPT ?= STM32L432xC
+
+  # Startup code to use
+  #  - it should exist in <chibios>/os/common/startup/ARMCMx/compilers/GCC/mk/
+  MCU_STARTUP ?= stm32l4xx
+
+  # Board: it should exist either in <chibios>/os/hal/boards/,
+  # <keyboard_dir>/boards/, or drivers/boards/
+  BOARD ?= GENERIC_STM32_L433XC
+
+  PLATFORM_NAME ?= platform_l432
+
+  USE_FPU ?= yes
+
+  # Options to pass to dfu-util when flashing
+  DFU_ARGS ?= -d 0483:DF11 -a 0 -s 0x08000000:leave
+  DFU_SUFFIX_ARGS ?= -v 0483 -p DF11
+
+  # UF2 settings
+  UF2_FAMILY ?= STM32L4
 endif
 
 ifneq (,$(filter $(MCU),at90usb162 atmega16u2 atmega32u2 atmega16u4 atmega32u4 at90usb646 at90usb647 at90usb1286 at90usb1287))
diff --git a/quantum/process_keycode/process_auto_shift.c b/quantum/process_keycode/process_auto_shift.c
index bf359e994..51b0efdb4 100644
--- a/quantum/process_keycode/process_auto_shift.c
+++ b/quantum/process_keycode/process_auto_shift.c
@@ -216,7 +216,18 @@ bool process_auto_shift(uint16_t keycode, keyrecord_t *record) {
 #    endif
         }
     }
+    if (get_auto_shifted_key(keycode, record)) {
+        if (record->event.pressed) {
+            return autoshift_press(keycode, now, record);
+        } else {
+            autoshift_end(keycode, now, false);
+            return false;
+        }
+    }
+    return true;
+}
 
+__attribute__((weak)) bool get_auto_shifted_key(uint16_t keycode, keyrecord_t *record) {
     switch (keycode) {
 #    ifndef NO_AUTO_SHIFT_ALPHA
         case KC_A ... KC_Z:
@@ -229,14 +240,9 @@ bool process_auto_shift(uint16_t keycode, keyrecord_t *record) {
         case KC_MINUS ... KC_SLASH:
         case KC_NONUS_BSLASH:
 #    endif
-            if (record->event.pressed) {
-                return autoshift_press(keycode, now, record);
-            } else {
-                autoshift_end(keycode, now, false);
-                return false;
-            }
+            return true;
     }
-    return true;
+    return false;
 }
 
 #endif
diff --git a/quantum/process_keycode/process_auto_shift.h b/quantum/process_keycode/process_auto_shift.h
index 5b2718f11..00a9ab036 100644
--- a/quantum/process_keycode/process_auto_shift.h
+++ b/quantum/process_keycode/process_auto_shift.h
@@ -31,3 +31,4 @@ bool     get_autoshift_state(void);
 uint16_t get_autoshift_timeout(void);
 void     set_autoshift_timeout(uint16_t timeout);
 void     autoshift_matrix_scan(void);
+bool     get_auto_shifted_key(uint16_t keycode, keyrecord_t *record);
diff --git a/quantum/process_keycode/process_backlight.c b/quantum/process_keycode/process_backlight.c
index 4d12f6813..8b70339a5 100644
--- a/quantum/process_keycode/process_backlight.c
+++ b/quantum/process_keycode/process_backlight.c
@@ -16,11 +16,35 @@
 
 #include "process_backlight.h"
 
-#include "backlight.h"
+#ifdef LED_MATRIX_ENABLE
+#    include "led_matrix.h"
+#else
+#    include "backlight.h"
+#endif
 
 bool process_backlight(uint16_t keycode, keyrecord_t *record) {
     if (record->event.pressed) {
         switch (keycode) {
+#ifdef LED_MATRIX_ENABLE
+            case BL_ON:
+                led_matrix_enable();
+                return false;
+            case BL_OFF:
+                led_matrix_disable();
+                return false;
+            case BL_DEC:
+                led_matrix_decrease_val();
+                return false;
+            case BL_INC:
+                led_matrix_increase_val();
+                return false;
+            case BL_TOGG:
+                led_matrix_toggle();
+                return false;
+            case BL_STEP:
+                led_matrix_step();
+                return false;
+#else
             case BL_ON:
                 backlight_level(BACKLIGHT_LEVELS);
                 return false;
@@ -39,10 +63,11 @@ bool process_backlight(uint16_t keycode, keyrecord_t *record) {
             case BL_STEP:
                 backlight_step();
                 return false;
-#ifdef BACKLIGHT_BREATHING
+#    ifdef BACKLIGHT_BREATHING
             case BL_BRTG:
                 backlight_toggle_breathing();
                 return false;
+#    endif
 #endif
         }
     }
diff --git a/quantum/process_keycode/process_leader.c b/quantum/process_keycode/process_leader.c
index 58a615d85..cf63f2514 100644
--- a/quantum/process_keycode/process_leader.c
+++ b/quantum/process_keycode/process_leader.c
@@ -49,7 +49,10 @@ bool process_leader(uint16_t keycode, keyrecord_t *record) {
     // Leader key set-up
     if (record->event.pressed) {
         if (leading) {
-            if (timer_elapsed(leader_time) < LEADER_TIMEOUT) {
+#    ifndef LEADER_NO_TIMEOUT
+            if (timer_elapsed(leader_time) < LEADER_TIMEOUT)
+#    endif  // LEADER_NO_TIMEOUT
+            {
 #    ifndef LEADER_KEY_STRICT_KEY_PROCESSING
                 if ((keycode >= QK_MOD_TAP && keycode <= QK_MOD_TAP_MAX) || (keycode >= QK_LAYER_TAP && keycode <= QK_LAYER_TAP_MAX)) {
                     keycode = keycode & 0xFF;
diff --git a/quantum/process_keycode/process_leader.h b/quantum/process_keycode/process_leader.h
index 9844f27a1..f3fe14a43 100644
--- a/quantum/process_keycode/process_leader.h
+++ b/quantum/process_keycode/process_leader.h
@@ -35,4 +35,9 @@ void qk_leader_start(void);
     extern uint16_t leader_time;        \
     extern uint16_t leader_sequence[5]; \
     extern uint8_t  leader_sequence_size
-#define LEADER_DICTIONARY() if (leading && timer_elapsed(leader_time) > LEADER_TIMEOUT)
+
+#ifdef LEADER_NO_TIMEOUT
+#    define LEADER_DICTIONARY() if (leading && leader_sequence_size > 0 && timer_elapsed(leader_time) > LEADER_TIMEOUT)
+#else
+#    define LEADER_DICTIONARY() if (leading && timer_elapsed(leader_time) > LEADER_TIMEOUT)
+#endif
diff --git a/quantum/process_keycode/process_rgb.c b/quantum/process_keycode/process_rgb.c
index 5dd8e7809..167c0c03c 100644
--- a/quantum/process_keycode/process_rgb.c
+++ b/quantum/process_keycode/process_rgb.c
@@ -207,6 +207,11 @@ bool process_rgb(const uint16_t keycode, const keyrecord_t *record) {
                 rgblight_mode(RGBLIGHT_MODE_RGB_TEST);
 #endif
                 return false;
+            case RGB_MODE_TWINKLE:
+#if defined(RGBLIGHT_ENABLE) && !defined(RGBLIGHT_DISABLE_KEYCODES) && defined(RGBLIGHT_EFFECT_TWINKLE)
+                handleKeycodeRGBMode(RGBLIGHT_MODE_TWINKLE, RGBLIGHT_MODE_TWINKLE_end);
+#endif
+                return false;
         }
     }
 
diff --git a/quantum/quantum.c b/quantum/quantum.c
index b40b40544..8ccdb774b 100644
--- a/quantum/quantum.c
+++ b/quantum/quantum.c
@@ -15,6 +15,7 @@
  */
 
 #include "quantum.h"
+#include "magic.h"
 
 #ifdef BLUETOOTH_ENABLE
 #    include "outputselect.h"
@@ -233,7 +234,7 @@ bool process_record_quantum(keyrecord_t *record) {
 #ifdef AUDIO_ENABLE
             process_audio(keycode, record) &&
 #endif
-#ifdef BACKLIGHT_ENABLE
+#if defined(BACKLIGHT_ENABLE) || defined(LED_MATRIX_ENABLE)
             process_backlight(keycode, record) &&
 #endif
 #ifdef STENO_ENABLE
@@ -318,6 +319,17 @@ bool process_record_quantum(keyrecord_t *record) {
                 set_output(OUTPUT_BLUETOOTH);
                 return false;
 #endif
+#ifndef NO_ACTION_ONESHOT
+            case ONESHOT_TOGGLE:
+                oneshot_toggle();
+                break;
+            case ONESHOT_ENABLE:
+                oneshot_enable();
+                break;
+            case ONESHOT_DISABLE:
+                oneshot_disable();
+                break;
+#endif
         }
     }
 
@@ -341,26 +353,20 @@ layer_state_t update_tri_layer_state(layer_state_t state, uint8_t layer1, uint8_
 void update_tri_layer(uint8_t layer1, uint8_t layer2, uint8_t layer3) { layer_state_set(update_tri_layer_state(layer_state, layer1, layer2, layer3)); }
 
 void matrix_init_quantum() {
-#ifdef BOOTMAGIC_LITE
-    bootmagic_lite();
-#endif
-    if (!eeconfig_is_enabled()) {
-        eeconfig_init();
-    }
+    magic();
 #if defined(LED_NUM_LOCK_PIN) || defined(LED_CAPS_LOCK_PIN) || defined(LED_SCROLL_LOCK_PIN) || defined(LED_COMPOSE_PIN) || defined(LED_KANA_PIN)
     // TODO: remove calls to led_init_ports from keyboards and remove ifdef
     led_init_ports();
 #endif
 #ifdef BACKLIGHT_ENABLE
-#    ifdef LED_MATRIX_ENABLE
-    led_matrix_init();
-#    else
     backlight_init_ports();
-#    endif
 #endif
 #ifdef AUDIO_ENABLE
     audio_init();
 #endif
+#ifdef LED_MATRIX_ENABLE
+    led_matrix_init();
+#endif
 #ifdef RGB_MATRIX_ENABLE
     rgb_matrix_init();
 #endif
diff --git a/quantum/quantum.h b/quantum/quantum.h
index e24a4c43a..e4a7c5723 100644
--- a/quantum/quantum.h
+++ b/quantum/quantum.h
@@ -30,11 +30,11 @@
 #include "keymap.h"
 
 #ifdef BACKLIGHT_ENABLE
-#    ifdef LED_MATRIX_ENABLE
-#        include "led_matrix.h"
-#    else
-#        include "backlight.h"
-#    endif
+#    include "backlight.h"
+#endif
+
+#ifdef LED_MATRIX_ENABLE
+#    include "led_matrix.h"
 #endif
 
 #if defined(RGBLIGHT_ENABLE)
@@ -52,6 +52,7 @@
 #include "action_layer.h"
 #include "eeconfig.h"
 #include "bootloader.h"
+#include "bootmagic.h"
 #include "timer.h"
 #include "sync_timer.h"
 #include "config_common.h"
@@ -97,7 +98,7 @@ extern layer_state_t layer_state;
 #    include "process_music.h"
 #endif
 
-#ifdef BACKLIGHT_ENABLE
+#if defined(BACKLIGHT_ENABLE) || defined(LED_MATRIX_ENABLE)
 #    include "process_backlight.h"
 #endif
 
@@ -199,37 +200,8 @@ extern layer_state_t layer_state;
 #    include "usbpd.h"
 #endif
 
-// Function substitutions to ease GPIO manipulation
-#if defined(__AVR__)
-
-/*   The AVR series GPIOs have a one clock read delay for changes in the digital input signal.
- *   But here's more margin to make it two clocks. */
-#    if !defined(GPIO_INPUT_PIN_DELAY)
-#        define GPIO_INPUT_PIN_DELAY 2
-#    endif
-#    define waitInputPinDelay() wait_cpuclock(GPIO_INPUT_PIN_DELAY)
-
-#elif defined(__ARMEL__) || defined(__ARMEB__)
-
-/* For GPIOs on ARM-based MCUs, the input pins are sampled by the clock of the bus
- * to which the GPIO is connected.
- * The connected buses differ depending on the various series of MCUs.
- * And since the instruction execution clock of the CPU and the bus clock of GPIO are different,
- * there is a delay of several clocks to read the change of the input signal.
- *
- * Define this delay with the GPIO_INPUT_PIN_DELAY macro.
- * If the GPIO_INPUT_PIN_DELAY macro is not defined, the following default values will be used.
- * (A fairly large value of 0.25 microseconds is set.)
- */
-#    if !defined(GPIO_INPUT_PIN_DELAY)
-#        if defined(STM32_SYSCLK)
-#            define GPIO_INPUT_PIN_DELAY (STM32_SYSCLK / 1000000L / 4)
-#        elif defined(KINETIS_SYSCLK_FREQUENCY)
-#            define GPIO_INPUT_PIN_DELAY (KINETIS_SYSCLK_FREQUENCY / 1000000L / 4)
-#        endif
-#    endif
-#    define waitInputPinDelay() wait_cpuclock(GPIO_INPUT_PIN_DELAY)
-
+#ifdef ENCODER_ENABLE
+#    include "encoder.h"
 #endif
 
 // For tri-layer
@@ -256,15 +228,6 @@ bool     process_record_user(uint16_t keycode, keyrecord_t *record);
 void     post_process_record_kb(uint16_t keycode, keyrecord_t *record);
 void     post_process_record_user(uint16_t keycode, keyrecord_t *record);
 
-#ifndef BOOTMAGIC_LITE_COLUMN
-#    define BOOTMAGIC_LITE_COLUMN 0
-#endif
-#ifndef BOOTMAGIC_LITE_ROW
-#    define BOOTMAGIC_LITE_ROW 0
-#endif
-
-void bootmagic_lite(void);
-
 void reset_keyboard(void);
 
 void startup_user(void);
diff --git a/quantum/quantum_keycodes.h b/quantum/quantum_keycodes.h
index e49f8dcda..316c20fce 100644
--- a/quantum/quantum_keycodes.h
+++ b/quantum/quantum_keycodes.h
@@ -16,19 +16,7 @@
 
 #pragma once
 
-#if defined(SEQUENCER_ENABLE)
-#    include "sequencer.h"
-#endif
-
-#ifndef MIDI_ENABLE_STRICT
-#    define MIDI_ENABLE_STRICT 0
-#endif
-
-#if !MIDI_ENABLE_STRICT || (defined(MIDI_ENABLE) && defined(MIDI_ADVANCED))
-#    ifndef MIDI_TONE_KEYCODE_OCTAVES
-#        define MIDI_TONE_KEYCODE_OCTAVES 3
-#    endif
-#endif
+#include "sequencer.h"
 
 // Fillers to make layering more clear
 #define _______ KC_TRNS
@@ -67,6 +55,8 @@ enum quantum_keycodes {
     QK_ONE_SHOT_LAYER_MAX   = 0x54FF,
     QK_ONE_SHOT_MOD         = 0x5500,
     QK_ONE_SHOT_MOD_MAX     = 0x55FF,
+    QK_SWAP_HANDS           = 0x5600,
+    QK_SWAP_HANDS_MAX       = 0x56FF,
     QK_TAP_DANCE            = 0x5700,
     QK_TAP_DANCE_MAX        = 0x57FF,
     QK_LAYER_TAP_TOGGLE     = 0x5800,
@@ -77,507 +67,458 @@ enum quantum_keycodes {
     QK_STENO_BOLT           = 0x5A30,
     QK_STENO_GEMINI         = 0x5A31,
     QK_STENO_MAX            = 0x5A3F,
-    QK_SWAP_HANDS           = 0x5B00,
-    QK_SWAP_HANDS_MAX       = 0x5BFF,
-    QK_MOD_TAP              = 0x6000,
-    QK_MOD_TAP_MAX          = 0x7FFF,
-    QK_UNICODE              = 0x8000,
-    QK_UNICODE_MAX          = 0xFFFF,
-    QK_UNICODEMAP           = 0x8000,
-    QK_UNICODEMAP_MAX       = 0xBFFF,
-    QK_UNICODEMAP_PAIR      = 0xC000,
-    QK_UNICODEMAP_PAIR_MAX  = 0xFFFF,
+    // 0x5C00 - 0x5FFF are reserved, see below
+    QK_MOD_TAP             = 0x6000,
+    QK_MOD_TAP_MAX         = 0x7FFF,
+    QK_UNICODE             = 0x8000,
+    QK_UNICODE_MAX         = 0xFFFF,
+    QK_UNICODEMAP          = 0x8000,
+    QK_UNICODEMAP_MAX      = 0xBFFF,
+    QK_UNICODEMAP_PAIR     = 0xC000,
+    QK_UNICODEMAP_PAIR_MAX = 0xFFFF,
 
     // Loose keycodes - to be used directly
     RESET = 0x5C00,
-    DEBUG,
-    MAGIC_SWAP_CONTROL_CAPSLOCK,
-    MAGIC_CAPSLOCK_TO_CONTROL,
-    MAGIC_SWAP_LALT_LGUI,
-    MAGIC_SWAP_RALT_RGUI,
-    MAGIC_NO_GUI,
-    MAGIC_SWAP_GRAVE_ESC,
-    MAGIC_SWAP_BACKSLASH_BACKSPACE,
-    MAGIC_HOST_NKRO,
-    MAGIC_SWAP_ALT_GUI,
-    MAGIC_UNSWAP_CONTROL_CAPSLOCK,
-    MAGIC_UNCAPSLOCK_TO_CONTROL,
-    MAGIC_UNSWAP_LALT_LGUI,
-    MAGIC_UNSWAP_RALT_RGUI,
-    MAGIC_UNNO_GUI,
-    MAGIC_UNSWAP_GRAVE_ESC,
-    MAGIC_UNSWAP_BACKSLASH_BACKSPACE,
-    MAGIC_UNHOST_NKRO,
-    MAGIC_UNSWAP_ALT_GUI,
-    MAGIC_TOGGLE_NKRO,
-    MAGIC_TOGGLE_ALT_GUI,
-    GRAVE_ESC,
-
-// Leader key
-#ifdef LEADER_ENABLE
-    KC_LEAD,
-#endif
-
-// Auto Shift setup
-#ifndef AUTO_SHIFT_NO_SETUP
-    KC_ASUP,
-    KC_ASDN,
-    KC_ASRP,
-#endif
-    KC_ASTG,
-    KC_ASON,
-    KC_ASOFF,
-
-    // Audio on/off/toggle
-    AU_ON,
-    AU_OFF,
-    AU_TOG,
-
-    // Faux clicky as part of main audio feature
-    CLICKY_TOGGLE,
-    CLICKY_ENABLE,
-    CLICKY_DISABLE,
-    CLICKY_UP,
-    CLICKY_DOWN,
-    CLICKY_RESET,
-
-    // Music mode on/off/toggle
-    MU_ON,
-    MU_OFF,
-    MU_TOG,
-
-    // Music mode cycle
-    MU_MOD,
-
-    // Music voice iterate
-    MUV_IN,
-    MUV_DE,
-
-// Midi
-#if !MIDI_ENABLE_STRICT || (defined(MIDI_ENABLE) && defined(MIDI_BASIC))
-    MI_ON,
-    MI_OFF,
-    MI_TOG,
-#endif
-
-#if !MIDI_ENABLE_STRICT || (defined(MIDI_ENABLE) && defined(MIDI_ADVANCED))
-    MIDI_TONE_MIN,
-
-#    if !MIDI_ENABLE_STRICT || MIDI_TONE_KEYCODE_OCTAVES > 0
-    MI_C = MIDI_TONE_MIN,
-    MI_Cs,
+    DEBUG,  // 5C01
+
+    // Magic
+    MAGIC_SWAP_CONTROL_CAPSLOCK,       // 5C02
+    MAGIC_CAPSLOCK_TO_CONTROL,         // 5C03
+    MAGIC_SWAP_LALT_LGUI,              // 5C04
+    MAGIC_SWAP_RALT_RGUI,              // 5C05
+    MAGIC_NO_GUI,                      // 5C06
+    MAGIC_SWAP_GRAVE_ESC,              // 5C07
+    MAGIC_SWAP_BACKSLASH_BACKSPACE,    // 5C08
+    MAGIC_HOST_NKRO,                   // 5C09
+    MAGIC_SWAP_ALT_GUI,                // 5C0A
+    MAGIC_UNSWAP_CONTROL_CAPSLOCK,     // 5C0B
+    MAGIC_UNCAPSLOCK_TO_CONTROL,       // 5C0C
+    MAGIC_UNSWAP_LALT_LGUI,            // 5C0D
+    MAGIC_UNSWAP_RALT_RGUI,            // 5C0E
+    MAGIC_UNNO_GUI,                    // 5C0F
+    MAGIC_UNSWAP_GRAVE_ESC,            // 5C10
+    MAGIC_UNSWAP_BACKSLASH_BACKSPACE,  // 5C11
+    MAGIC_UNHOST_NKRO,                 // 5C12
+    MAGIC_UNSWAP_ALT_GUI,              // 5C13
+    MAGIC_TOGGLE_NKRO,                 // 5C14
+    MAGIC_TOGGLE_ALT_GUI,              // 5C15
+
+    // Grave Escape
+    GRAVE_ESC,  // 5C16
+
+    // Auto Shift
+    KC_ASUP,   // 5C17
+    KC_ASDN,   // 5C18
+    KC_ASRP,   // 5C19
+    KC_ASTG,   // 5C1A
+    KC_ASON,   // 5C1B
+    KC_ASOFF,  // 5C1C
+
+    // Audio
+    AU_ON,   // 5C1D
+    AU_OFF,  // 5C1E
+    AU_TOG,  // 5C1F
+
+    // Audio Clicky
+    CLICKY_TOGGLE,   // 5C20
+    CLICKY_ENABLE,   // 5C21
+    CLICKY_DISABLE,  // 5C22
+    CLICKY_UP,       // 5C23
+    CLICKY_DOWN,     // 5C24
+    CLICKY_RESET,    // 5C25
+
+    // Music mode
+    MU_ON,   // 5C26
+    MU_OFF,  // 5C27
+    MU_TOG,  // 5C28
+    MU_MOD,  // 5C29
+    MUV_IN,  // 5C2A
+    MUV_DE,  // 5C2B
+
+    // MIDI
+    MI_ON,   // 5C2C
+    MI_OFF,  // 5C2D
+    MI_TOG,  // 5C2E
+
+    MI_C,   // 5C2F
+    MI_Cs,  // 5C30
     MI_Db = MI_Cs,
-    MI_D,
-    MI_Ds,
+    MI_D,   // 5C31
+    MI_Ds,  // 5C32
     MI_Eb = MI_Ds,
-    MI_E,
-    MI_F,
-    MI_Fs,
+    MI_E,   // 5C33
+    MI_F,   // 5C34
+    MI_Fs,  // 5C35
     MI_Gb = MI_Fs,
-    MI_G,
-    MI_Gs,
+    MI_G,   // 5C36
+    MI_Gs,  // 5C37
     MI_Ab = MI_Gs,
-    MI_A,
-    MI_As,
+    MI_A,   // 5C38
+    MI_As,  // 5C39
     MI_Bb = MI_As,
-    MI_B,
-#    endif
+    MI_B,  // 5C3A
 
-#    if !MIDI_ENABLE_STRICT || MIDI_TONE_KEYCODE_OCTAVES > 1
-    MI_C_1,
-    MI_Cs_1,
+    MI_C_1,   // 5C3B
+    MI_Cs_1,  // 5C3C
     MI_Db_1 = MI_Cs_1,
-    MI_D_1,
-    MI_Ds_1,
+    MI_D_1,   // 5C3D
+    MI_Ds_1,  // 5C3E
     MI_Eb_1 = MI_Ds_1,
-    MI_E_1,
-    MI_F_1,
-    MI_Fs_1,
+    MI_E_1,   // 5C3F
+    MI_F_1,   // 5C40
+    MI_Fs_1,  // 5C41
     MI_Gb_1 = MI_Fs_1,
-    MI_G_1,
-    MI_Gs_1,
+    MI_G_1,   // 5C42
+    MI_Gs_1,  // 5C43
     MI_Ab_1 = MI_Gs_1,
-    MI_A_1,
-    MI_As_1,
+    MI_A_1,   // 5C44
+    MI_As_1,  // 5C45
     MI_Bb_1 = MI_As_1,
-    MI_B_1,
-#    endif
+    MI_B_1,  // 5C46
 
-#    if !MIDI_ENABLE_STRICT || MIDI_TONE_KEYCODE_OCTAVES > 2
-    MI_C_2,
-    MI_Cs_2,
+    MI_C_2,   // 5C47
+    MI_Cs_2,  // 5C48
     MI_Db_2 = MI_Cs_2,
-    MI_D_2,
-    MI_Ds_2,
+    MI_D_2,   // 5C49
+    MI_Ds_2,  // 5C4A
     MI_Eb_2 = MI_Ds_2,
-    MI_E_2,
-    MI_F_2,
-    MI_Fs_2,
+    MI_E_2,   // 5C4B
+    MI_F_2,   // 5C4C
+    MI_Fs_2,  // 5C4D
     MI_Gb_2 = MI_Fs_2,
-    MI_G_2,
-    MI_Gs_2,
+    MI_G_2,   // 5C4E
+    MI_Gs_2,  // 5C4F
     MI_Ab_2 = MI_Gs_2,
-    MI_A_2,
-    MI_As_2,
+    MI_A_2,   // 5C50
+    MI_As_2,  // 5C51
     MI_Bb_2 = MI_As_2,
-    MI_B_2,
-#    endif
+    MI_B_2,  // 5C52
 
-#    if !MIDI_ENABLE_STRICT || MIDI_TONE_KEYCODE_OCTAVES > 3
-    MI_C_3,
-    MI_Cs_3,
+    MI_C_3,   // 5C53
+    MI_Cs_3,  // 5C54
     MI_Db_3 = MI_Cs_3,
-    MI_D_3,
-    MI_Ds_3,
+    MI_D_3,   // 5C55
+    MI_Ds_3,  // 5C56
     MI_Eb_3 = MI_Ds_3,
-    MI_E_3,
-    MI_F_3,
-    MI_Fs_3,
+    MI_E_3,   // 5C57
+    MI_F_3,   // 5C58
+    MI_Fs_3,  // 5C59
     MI_Gb_3 = MI_Fs_3,
-    MI_G_3,
-    MI_Gs_3,
+    MI_G_3,   // 5C5A
+    MI_Gs_3,  // 5C5B
     MI_Ab_3 = MI_Gs_3,
-    MI_A_3,
-    MI_As_3,
+    MI_A_3,   // 5C5C
+    MI_As_3,  // 5C5D
     MI_Bb_3 = MI_As_3,
-    MI_B_3,
-#    endif
+    MI_B_3,  // 5C5E
 
-#    if !MIDI_ENABLE_STRICT || MIDI_TONE_KEYCODE_OCTAVES > 4
-    MI_C_4,
-    MI_Cs_4,
+    MI_C_4,   // 5C5F
+    MI_Cs_4,  // 5C60
     MI_Db_4 = MI_Cs_4,
-    MI_D_4,
-    MI_Ds_4,
+    MI_D_4,   // 5C61
+    MI_Ds_4,  // 5C62
     MI_Eb_4 = MI_Ds_4,
-    MI_E_4,
-    MI_F_4,
-    MI_Fs_4,
+    MI_E_4,   // 5C63
+    MI_F_4,   // 5C64
+    MI_Fs_4,  // 5C65
     MI_Gb_4 = MI_Fs_4,
-    MI_G_4,
-    MI_Gs_4,
+    MI_G_4,   // 5C66
+    MI_Gs_4,  // 5C67
     MI_Ab_4 = MI_Gs_4,
-    MI_A_4,
-    MI_As_4,
+    MI_A_4,   // 5C68
+    MI_As_4,  // 5C69
     MI_Bb_4 = MI_As_4,
-    MI_B_4,
-#    endif
+    MI_B_4,  // 5C6A
 
-#    if !MIDI_ENABLE_STRICT || MIDI_TONE_KEYCODE_OCTAVES > 5
-    MI_C_5,
-    MI_Cs_5,
+    MI_C_5,   // 5C6B
+    MI_Cs_5,  // 5C6C
     MI_Db_5 = MI_Cs_5,
-    MI_D_5,
-    MI_Ds_5,
+    MI_D_5,   // 5C6D
+    MI_Ds_5,  // 5C6E
     MI_Eb_5 = MI_Ds_5,
-    MI_E_5,
-    MI_F_5,
-    MI_Fs_5,
+    MI_E_5,   // 5C6F
+    MI_F_5,   // 5C70
+    MI_Fs_5,  // 5C71
     MI_Gb_5 = MI_Fs_5,
-    MI_G_5,
-    MI_Gs_5,
+    MI_G_5,   // 5C72
+    MI_Gs_5,  // 5C73
     MI_Ab_5 = MI_Gs_5,
-    MI_A_5,
-    MI_As_5,
+    MI_A_5,   // 5C74
+    MI_As_5,  // 5C75
     MI_Bb_5 = MI_As_5,
-    MI_B_5,
-#    endif
-
-#    if !MIDI_ENABLE_STRICT || MIDI_TONE_KEYCODE_OCTAVES > 5
-    MIDI_TONE_MAX = MI_B_5,
-#    elif MIDI_TONE_KEYCODE_OCTAVES > 4
-    MIDI_TONE_MAX = MI_B_4,
-#    elif MIDI_TONE_KEYCODE_OCTAVES > 3
-    MIDI_TONE_MAX = MI_B_3,
-#    elif MIDI_TONE_KEYCODE_OCTAVES > 2
-    MIDI_TONE_MAX = MI_B_2,
-#    elif MIDI_TONE_KEYCODE_OCTAVES > 1
-    MIDI_TONE_MAX = MI_B_1,
-#    elif MIDI_TONE_KEYCODE_OCTAVES > 0
-    MIDI_TONE_MAX = MI_B,
-#    endif
-
-    MIDI_OCTAVE_MIN,
-    MI_OCT_N2 = MIDI_OCTAVE_MIN,
-    MI_OCT_N1,
-    MI_OCT_0,
-    MI_OCT_1,
-    MI_OCT_2,
-    MI_OCT_3,
-    MI_OCT_4,
-    MI_OCT_5,
-    MI_OCT_6,
-    MI_OCT_7,
-    MIDI_OCTAVE_MAX = MI_OCT_7,
-    MI_OCTD,  // octave down
-    MI_OCTU,  // octave up
-
-    MIDI_TRANSPOSE_MIN,
-    MI_TRNS_N6 = MIDI_TRANSPOSE_MIN,
-    MI_TRNS_N5,
-    MI_TRNS_N4,
-    MI_TRNS_N3,
-    MI_TRNS_N2,
-    MI_TRNS_N1,
-    MI_TRNS_0,
-    MI_TRNS_1,
-    MI_TRNS_2,
-    MI_TRNS_3,
-    MI_TRNS_4,
-    MI_TRNS_5,
-    MI_TRNS_6,
-    MIDI_TRANSPOSE_MAX = MI_TRNS_6,
-    MI_TRNSD,  // transpose down
-    MI_TRNSU,  // transpose up
-
-    MIDI_VELOCITY_MIN,
-    MI_VEL_0 = MIDI_VELOCITY_MIN,
-#    ifdef VIA_ENABLE
-    MI_VEL_1 = MIDI_VELOCITY_MIN,
-#    else
-    MI_VEL_1,
-#    endif
-    MI_VEL_2,
-    MI_VEL_3,
-    MI_VEL_4,
-    MI_VEL_5,
-    MI_VEL_6,
-    MI_VEL_7,
-    MI_VEL_8,
-    MI_VEL_9,
-    MI_VEL_10,
-    MIDI_VELOCITY_MAX = MI_VEL_10,
-    MI_VELD,  // velocity down
-    MI_VELU,  // velocity up
-
-    MIDI_CHANNEL_MIN,
-    MI_CH1 = MIDI_CHANNEL_MIN,
-    MI_CH2,
-    MI_CH3,
-    MI_CH4,
-    MI_CH5,
-    MI_CH6,
-    MI_CH7,
-    MI_CH8,
-    MI_CH9,
-    MI_CH10,
-    MI_CH11,
-    MI_CH12,
-    MI_CH13,
-    MI_CH14,
-    MI_CH15,
-    MI_CH16,
-    MIDI_CHANNEL_MAX = MI_CH16,
-    MI_CHD,  // previous channel
-    MI_CHU,  // next channel
-
-    MI_ALLOFF,  // all notes off
-
-    MI_SUS,   // sustain
-    MI_PORT,  // portamento
-    MI_SOST,  // sostenuto
-    MI_SOFT,  // soft pedal
-    MI_LEG,   // legato
-
-    MI_MOD,    // modulation
-    MI_MODSD,  // decrease modulation speed
-    MI_MODSU,  // increase modulation speed
-
-    MI_BENDD,  // Bend down
-    MI_BENDU,  // Bend up
-#endif         // MIDI_ADVANCED
-
-    // Backlight functionality
-    BL_ON,
-    BL_OFF,
-    BL_DEC,
-    BL_INC,
-    BL_TOGG,
-    BL_STEP,
-    BL_BRTG,
-
-    // RGB functionality
-    RGB_TOG,
-    RGB_MODE_FORWARD,
-    RGB_MODE_REVERSE,
-    RGB_HUI,
-    RGB_HUD,
-    RGB_SAI,
-    RGB_SAD,
-    RGB_VAI,
-    RGB_VAD,
-    RGB_SPI,
-    RGB_SPD,
-    RGB_MODE_PLAIN,
-    RGB_MODE_BREATHE,
-    RGB_MODE_RAINBOW,
-    RGB_MODE_SWIRL,
-    RGB_MODE_SNAKE,
-    RGB_MODE_KNIGHT,
-    RGB_MODE_XMAS,
-    RGB_MODE_GRADIENT,
-    RGB_MODE_RGBTEST,
-
-    // Momentum matching toggle
-    VLK_TOG,
-
-    // Left shift, open paren
-    KC_LSPO,
-
-    // Right shift, close paren
-    KC_RSPC,
-
-    // Shift, Enter
-    KC_SFTENT,
-
-    // Printing
-    PRINT_ON,
-    PRINT_OFF,
-
-    // output selection
-    OUT_AUTO,
-    OUT_USB,
-#ifdef BLUETOOTH_ENABLE
-    OUT_BT,
-#endif
-
-#ifdef KEY_LOCK_ENABLE
-    KC_LOCK,
+    MI_B_5,  // 5C76
+
+    MI_OCT_N2,  // 5C77
+    MI_OCT_N1,  // 5C78
+    MI_OCT_0,   // 5C79
+    MI_OCT_1,   // 5C7A
+    MI_OCT_2,   // 5C7B
+    MI_OCT_3,   // 5C7C
+    MI_OCT_4,   // 5C7D
+    MI_OCT_5,   // 5C7E
+    MI_OCT_6,   // 5C7F
+    MI_OCT_7,   // 5C80
+    MI_OCTD,    // 5C81
+    MI_OCTU,    // 5C82
+
+    MI_TRNS_N6,  // 5C83
+    MI_TRNS_N5,  // 5C84
+    MI_TRNS_N4,  // 5C85
+    MI_TRNS_N3,  // 5C86
+    MI_TRNS_N2,  // 5C87
+    MI_TRNS_N1,  // 5C88
+    MI_TRNS_0,   // 5C89
+    MI_TRNS_1,   // 5C8A
+    MI_TRNS_2,   // 5C8B
+    MI_TRNS_3,   // 5C8C
+    MI_TRNS_4,   // 5C8D
+    MI_TRNS_5,   // 5C8E
+    MI_TRNS_6,   // 5C8F
+    MI_TRNSD,    // 5C90
+    MI_TRNSU,    // 5C91
+
+    MI_VEL_0,  // 5C92
+#ifdef VIA_ENABLE
+    MI_VEL_1 = MI_VEL_0,
+#else
+    MI_VEL_1,  // 5C93
 #endif
-
-#ifdef TERMINAL_ENABLE
-    TERM_ON,
-    TERM_OFF,
-#endif
-
-    EEPROM_RESET,
-
-    UNICODE_MODE_FORWARD,
-    UNICODE_MODE_REVERSE,
-    UNICODE_MODE_MAC,
-    UNICODE_MODE_LNX,
-    UNICODE_MODE_WIN,
-    UNICODE_MODE_BSD,
-    UNICODE_MODE_WINC,
-
-    HPT_ON,
-    HPT_OFF,
-    HPT_TOG,
-    HPT_RST,
-    HPT_FBK,
-    HPT_BUZ,
-    HPT_MODI,
-    HPT_MODD,
-    HPT_CONT,
-    HPT_CONI,
-    HPT_COND,
-    HPT_DWLI,
-    HPT_DWLD,
-
-    // Left control, open paren
-    KC_LCPO,
-
-    // Right control, close paren
-    KC_RCPC,
-
-    // Left control, open paren
-    KC_LAPO,
-
-    // Right control, close paren
-    KC_RAPC,
-
-    CMB_ON,
-    CMB_OFF,
-    CMB_TOG,
-
-    MAGIC_SWAP_LCTL_LGUI,
-    MAGIC_SWAP_RCTL_RGUI,
-    MAGIC_UNSWAP_LCTL_LGUI,
-    MAGIC_UNSWAP_RCTL_RGUI,
-    MAGIC_SWAP_CTL_GUI,
-    MAGIC_UNSWAP_CTL_GUI,
-    MAGIC_TOGGLE_CTL_GUI,
-    MAGIC_EE_HANDS_LEFT,
-    MAGIC_EE_HANDS_RIGHT,
+    MI_VEL_2,   // 5C94
+    MI_VEL_3,   // 5C95
+    MI_VEL_4,   // 5C96
+    MI_VEL_5,   // 5C97
+    MI_VEL_6,   // 5C98
+    MI_VEL_7,   // 5C99
+    MI_VEL_8,   // 5C9A
+    MI_VEL_9,   // 5C9B
+    MI_VEL_10,  // 5C9C
+    MI_VELD,    // 5C9D
+    MI_VELU,    // 5C9E
+
+    MI_CH1,   // 5C9F
+    MI_CH2,   // 5CA0
+    MI_CH3,   // 5CA1
+    MI_CH4,   // 5CA2
+    MI_CH5,   // 5CA3
+    MI_CH6,   // 5CA4
+    MI_CH7,   // 5CA5
+    MI_CH8,   // 5CA6
+    MI_CH9,   // 5CA7
+    MI_CH10,  // 5CA8
+    MI_CH11,  // 5CA9
+    MI_CH12,  // 5CAA
+    MI_CH13,  // 5CAB
+    MI_CH14,  // 5CAC
+    MI_CH15,  // 5CAD
+    MI_CH16,  // 5CAE
+    MI_CHD,   // 5CAF
+    MI_CHU,   // 5CB0
+
+    MI_ALLOFF,  // 5CB1
+
+    MI_SUS,   // 5CB2
+    MI_PORT,  // 5CB3
+    MI_SOST,  // 5CB4
+    MI_SOFT,  // 5CB5
+    MI_LEG,   // 5CB6
+
+    MI_MOD,    // 5CB7
+    MI_MODSD,  // 5CB8
+    MI_MODSU,  // 5CB9
+
+    MI_BENDD,  // 5CBA
+    MI_BENDU,  // 5CBB
+
+    // Backlight
+    BL_ON,    // 5CBC
+    BL_OFF,   // 5CBD
+    BL_DEC,   // 5CBE
+    BL_INC,   // 5CBF
+    BL_TOGG,  // 5CC0
+    BL_STEP,  // 5CC1
+    BL_BRTG,  // 5CC2
+
+    // RGB underglow/matrix
+    RGB_TOG,            // 5CC3
+    RGB_MODE_FORWARD,   // 5CC4
+    RGB_MODE_REVERSE,   // 5CC5
+    RGB_HUI,            // 5CC6
+    RGB_HUD,            // 5CC7
+    RGB_SAI,            // 5CC8
+    RGB_SAD,            // 5CC9
+    RGB_VAI,            // 5CCA
+    RGB_VAD,            // 5CCB
+    RGB_SPI,            // 5CCC
+    RGB_SPD,            // 5CCD
+    RGB_MODE_PLAIN,     // 5CCE
+    RGB_MODE_BREATHE,   // 5CCF
+    RGB_MODE_RAINBOW,   // 5CD0
+    RGB_MODE_SWIRL,     // 5CD1
+    RGB_MODE_SNAKE,     // 5CD2
+    RGB_MODE_KNIGHT,    // 5CD3
+    RGB_MODE_XMAS,      // 5CD4
+    RGB_MODE_GRADIENT,  // 5CD5
+    RGB_MODE_RGBTEST,   // 5CD6
+
+    // Velocikey
+    VLK_TOG,  // 5CD7
+
+    // Space Cadet
+    KC_LSPO,    // 5CD8
+    KC_RSPC,    // 5CD9
+    KC_SFTENT,  // 5CDA
+
+    // Thermal Printer
+    PRINT_ON,   // 5CDB
+    PRINT_OFF,  // 5CDC
+
+    // Bluetooth: output selection
+    OUT_AUTO,  // 5CDD
+    OUT_USB,   // 5CDE
+
+    // Clear EEPROM
+    EEPROM_RESET,  // 5CDF
+
+    // Unicode
+    UNICODE_MODE_FORWARD,  // 5CE0
+    UNICODE_MODE_REVERSE,  // 5CE1
+    UNICODE_MODE_MAC,      // 5CE2
+    UNICODE_MODE_LNX,      // 5CE3
+    UNICODE_MODE_WIN,      // 5CE4
+    UNICODE_MODE_BSD,      // 5CE5
+    UNICODE_MODE_WINC,     // 5CE6
+
+    // Haptic
+    HPT_ON,    // 5CE7
+    HPT_OFF,   // 5CE8
+    HPT_TOG,   // 5CE9
+    HPT_RST,   // 5CEA
+    HPT_FBK,   // 5CEB
+    HPT_BUZ,   // 5CEC
+    HPT_MODI,  // 5CED
+    HPT_MODD,  // 5CEE
+    HPT_CONT,  // 5CEF
+    HPT_CONI,  // 5CF0
+    HPT_COND,  // 5CF1
+    HPT_DWLI,  // 5CF2
+    HPT_DWLD,  // 5CF3
+
+    // Space Cadet (continued)
+    KC_LCPO,  // 5CF4
+    KC_RCPC,  // 5CF5
+    KC_LAPO,  // 5CF6
+    KC_RAPC,  // 5CF7
+
+    // Combos
+    CMB_ON,   // 5CF8
+    CMB_OFF,  // 5CF9
+    CMB_TOG,  // 5CFA
+
+    // Magic (continued)
+    MAGIC_SWAP_LCTL_LGUI,    // 5CFB
+    MAGIC_SWAP_RCTL_RGUI,    // 5CFC
+    MAGIC_UNSWAP_LCTL_LGUI,  // 5CFD
+    MAGIC_UNSWAP_RCTL_RGUI,  // 5CFE
+    MAGIC_SWAP_CTL_GUI,      // 5CFF
+    MAGIC_UNSWAP_CTL_GUI,    // 5D00
+    MAGIC_TOGGLE_CTL_GUI,    // 5D01
+    MAGIC_EE_HANDS_LEFT,     // 5D02
+    MAGIC_EE_HANDS_RIGHT,    // 5D03
 
     // Dynamic Macros
-    DYN_REC_START1,
-    DYN_REC_START2,
-    DYN_REC_STOP,
-    DYN_MACRO_PLAY1,
-    DYN_MACRO_PLAY2,
-
-    JS_BUTTON0,
-    JS_BUTTON_MIN = JS_BUTTON0,
-    JS_BUTTON1,
-    JS_BUTTON2,
-    JS_BUTTON3,
-    JS_BUTTON4,
-    JS_BUTTON5,
-    JS_BUTTON6,
-    JS_BUTTON7,
-    JS_BUTTON8,
-    JS_BUTTON9,
-    JS_BUTTON10,
-    JS_BUTTON11,
-    JS_BUTTON12,
-    JS_BUTTON13,
-    JS_BUTTON14,
-    JS_BUTTON15,
-    JS_BUTTON16,
-    JS_BUTTON17,
-    JS_BUTTON18,
-    JS_BUTTON19,
-    JS_BUTTON20,
-    JS_BUTTON21,
-    JS_BUTTON22,
-    JS_BUTTON23,
-    JS_BUTTON24,
-    JS_BUTTON25,
-    JS_BUTTON26,
-    JS_BUTTON27,
-    JS_BUTTON28,
-    JS_BUTTON29,
-    JS_BUTTON30,
-    JS_BUTTON31,
-    JS_BUTTON_MAX = JS_BUTTON31,
-
-#if defined(SEQUENCER_ENABLE)
-    SQ_ON,
-    SQ_OFF,
-    SQ_TOG,
-
-    SQ_TMPD,  // Decrease tempo
-    SQ_TMPU,  // Increase tempo
+    DYN_REC_START1,   // 5D04
+    DYN_REC_START2,   // 5D05
+    DYN_REC_STOP,     // 5D06
+    DYN_MACRO_PLAY1,  // 5D07
+    DYN_MACRO_PLAY2,  // 5D08
+
+    // Joystick
+    JS_BUTTON0,   // 5D09
+    JS_BUTTON1,   // 5D0A
+    JS_BUTTON2,   // 5D0B
+    JS_BUTTON3,   // 5D0C
+    JS_BUTTON4,   // 5D0D
+    JS_BUTTON5,   // 5D0E
+    JS_BUTTON6,   // 5D0F
+    JS_BUTTON7,   // 5D10
+    JS_BUTTON8,   // 5D11
+    JS_BUTTON9,   // 5D12
+    JS_BUTTON10,  // 5D13
+    JS_BUTTON11,  // 5D14
+    JS_BUTTON12,  // 5D15
+    JS_BUTTON13,  // 5D16
+    JS_BUTTON14,  // 5D17
+    JS_BUTTON15,  // 5D18
+    JS_BUTTON16,  // 5D19
+    JS_BUTTON17,  // 5D1A
+    JS_BUTTON18,  // 5D1B
+    JS_BUTTON19,  // 5D1C
+    JS_BUTTON20,  // 5D1D
+    JS_BUTTON21,  // 5D1E
+    JS_BUTTON22,  // 5D1F
+    JS_BUTTON23,  // 5D20
+    JS_BUTTON24,  // 5D21
+    JS_BUTTON25,  // 5D22
+    JS_BUTTON26,  // 5D23
+    JS_BUTTON27,  // 5D24
+    JS_BUTTON28,  // 5D25
+    JS_BUTTON29,  // 5D26
+    JS_BUTTON30,  // 5D27
+    JS_BUTTON31,  // 5D28
+
+    // Leader Key
+    KC_LEAD,  // 5D29
+
+    // Bluetooth: output selection (continued)
+    OUT_BT,  // 5D2A
+
+    // Lock Key
+    KC_LOCK,  // 5D2B
+
+    // Terminal
+    TERM_ON,   // 5D2C
+    TERM_OFF,  // 5D2D
+
+    // Sequencer
+    SQ_ON,   // 5D2E
+    SQ_OFF,  // 5D2F
+    SQ_TOG,  // 5D30
+
+    SQ_TMPD,  // 5D31
+    SQ_TMPU,  // 5D32
+
+    SQ_RESD,  // 5D33
+    SQ_RESU,  // 5D34
+
+    SQ_SALL,  // 5D35
+    SQ_SCLR,  // 5D36
+
+    SEQUENCER_STEP_MIN,  // 5D37
+    SEQUENCER_STEP_MAX = SEQUENCER_STEP_MIN + SEQUENCER_STEPS,
 
     SEQUENCER_RESOLUTION_MIN,
     SEQUENCER_RESOLUTION_MAX = SEQUENCER_RESOLUTION_MIN + SEQUENCER_RESOLUTIONS,
-    SQ_RESD,  // Decrease resolution
-    SQ_RESU,  // Increase resolution
-
-    SQ_SALL,  // All steps on
-    SQ_SCLR,  // All steps off
-    SEQUENCER_STEP_MIN,
-    SEQUENCER_STEP_MAX = SEQUENCER_STEP_MIN + SEQUENCER_STEPS,
 
     SEQUENCER_TRACK_MIN,
     SEQUENCER_TRACK_MAX = SEQUENCER_TRACK_MIN + SEQUENCER_TRACKS,
 
-/**
- * Helpers to assign a keycode to a step, a resolution, or a track.
- * Falls back to NOOP if n is out of range.
- */
-#    define SQ_S(n) (n < SEQUENCER_STEPS ? SEQUENCER_STEP_MIN + n : XXXXXXX)
-#    define SQ_R(n) (n < SEQUENCER_RESOLUTIONS ? SEQUENCER_RESOLUTION_MIN + n : XXXXXXX)
-#    define SQ_T(n) (n < SEQUENCER_TRACKS ? SEQUENCER_TRACK_MIN + n : XXXXXXX)
+#define SQ_S(n) (n < SEQUENCER_STEPS ? SEQUENCER_STEP_MIN + n : KC_NO)
+#define SQ_R(n) (n < SEQUENCER_RESOLUTIONS ? SEQUENCER_RESOLUTION_MIN + n : KC_NO)
+#define SQ_T(n) (n < SEQUENCER_TRACKS ? SEQUENCER_TRACK_MIN + n : KC_NO)
 
-#endif
+    // One Shot
+    ONESHOT_ENABLE,
+    ONESHOT_DISABLE,
+    ONESHOT_TOGGLE,
+
+    // RGB underglow/matrix (continued)
+    RGB_MODE_TWINKLE,
 
-    // always leave at the end
+    // Start of custom keycode range for keyboards and keymaps - always leave at the end
     SAFE_RANGE
 };
 
-// Ability to use mods in layouts
+// Keycode modifiers & aliases
 #define LCTL(kc) (QK_LCTL | (kc))
 #define LSFT(kc) (QK_LSFT | (kc))
 #define LALT(kc) (QK_LALT | (kc))
@@ -609,11 +550,7 @@ enum quantum_keycodes {
 #define MOD_HYPR 0xF
 #define MOD_MEH 0x7
 
-// Aliases for shifted symbols
-// Each key has a 4-letter code, and some have longer aliases too.
-// While the long aliases are descriptive, the 4-letter codes
-// make for nicer grid layouts (everything lines up), and are
-// the preferred style for Quantum.
+// US ANSI shifted keycode aliases
 #define KC_TILD LSFT(KC_GRV)  // ~
 #define KC_TILDE KC_TILD
 
@@ -680,18 +617,15 @@ enum quantum_keycodes {
 
 #define KC_DELT KC_DELETE  // Del key (four letter code)
 
-// Alias for function layers than expand past FN31
-#define FUNC(kc) (QK_FUNCTION | (kc))
-
-// Aliases
+// Modified keycode aliases
 #define C(kc) LCTL(kc)
 #define S(kc) LSFT(kc)
 #define A(kc) LALT(kc)
 #define G(kc) LGUI(kc)
 
-#define F(kc) FUNC(kc)
+// Deprecated - do not use
+#define F(kc) (QK_FUNCTION | (kc))
 #define M(kc) (QK_MACRO | (kc))
-
 #define MACROTAP(kc) (QK_MACRO | (FUNC_TAP << 8) | (kc))
 #define MACRODOWN(...) (record->event.pressed ? MACRO(__VA_ARGS__) : MACRO_NONE)
 
@@ -699,19 +633,21 @@ enum quantum_keycodes {
 
 #define EEP_RST EEPROM_RESET
 
+// Audio Clicky aliases
 #define CK_TOGG CLICKY_TOGGLE
 #define CK_RST CLICKY_RESET
 #define CK_UP CLICKY_UP
 #define CK_DOWN CLICKY_DOWN
 #define CK_ON CLICKY_ENABLE
 #define CK_OFF CLICKY_DISABLE
+// Fauxclicky (deprecated) redirects to Audio Clicky
 #define FC_ON CLICKY_ENABLE
 #define FC_OFF CLICKY_DISABLE
 #define FC_TOGG CLICKY_TOGGLE
 
+// RGB aliases
 #define RGB_MOD RGB_MODE_FORWARD
 #define RGB_RMOD RGB_MODE_REVERSE
-
 #define RGB_M_P RGB_MODE_PLAIN
 #define RGB_M_B RGB_MODE_BREATHE
 #define RGB_M_R RGB_MODE_RAINBOW
@@ -721,10 +657,9 @@ enum quantum_keycodes {
 #define RGB_M_X RGB_MODE_XMAS
 #define RGB_M_G RGB_MODE_GRADIENT
 #define RGB_M_T RGB_MODE_RGBTEST
+#define RGB_M_TW RGB_MODE_TWINKLE
 
-// L-ayer, T-ap - 256 keycode max, 16 layer max
-#define LT(layer, kc) (QK_LAYER_TAP | (((layer)&0xF) << 8) | ((kc)&0xFF))
-
+// Magic aliases
 #define CL_SWAP MAGIC_SWAP_CONTROL_CAPSLOCK
 #define CL_NORM MAGIC_UNSWAP_CONTROL_CAPSLOCK
 #define CL_CTRL MAGIC_CAPSLOCK_TO_CONTROL
@@ -793,6 +728,9 @@ enum quantum_keycodes {
 // Layer tap-toggle
 #define TT(layer) (QK_LAYER_TAP_TOGGLE | ((layer)&0xFF))
 
+// L-ayer, T-ap - 256 keycode max, 16 layer max
+#define LT(layer, kc) (QK_LAYER_TAP | (((layer)&0xF) << 8) | ((kc)&0xFF))
+
 // M-od, T-ap - 256 keycode max
 #define MT(mod, kc) (QK_MOD_TAP | (((mod)&0x1F) << 8) | ((kc)&0xFF))
 
@@ -822,12 +760,12 @@ enum quantum_keycodes {
 #define CMD_T(kc) LCMD_T(kc)
 #define WIN_T(kc) LWIN_T(kc)
 
-#define C_S_T(kc) MT(MOD_LCTL | MOD_LSFT, kc)                         // Left Control + Shift e.g. for gnome-terminal
-#define MEH_T(kc) MT(MOD_LCTL | MOD_LSFT | MOD_LALT, kc)              // Meh is a less hyper version of the Hyper key -- doesn't include GUI, so just Left Control + Shift + Alt
-#define LCAG_T(kc) MT(MOD_LCTL | MOD_LALT | MOD_LGUI, kc)             // Left Control + Alt + GUI
-#define RCAG_T(kc) MT(MOD_RCTL | MOD_RALT | MOD_RGUI, kc)             // Right Control + Alt + GUI
+#define C_S_T(kc) MT(MOD_LCTL | MOD_LSFT, kc)  // Left Control + Shift e.g. for gnome-terminal
+#define MEH_T(kc) MT(MOD_LCTL | MOD_LSFT | MOD_LALT, kc)  // Meh is a less hyper version of the Hyper key -- doesn't include GUI, so just Left Control + Shift + Alt
+#define LCAG_T(kc) MT(MOD_LCTL | MOD_LALT | MOD_LGUI, kc)  // Left Control + Alt + GUI
+#define RCAG_T(kc) MT(MOD_RCTL | MOD_RALT | MOD_RGUI, kc)  // Right Control + Alt + GUI
 #define HYPR_T(kc) MT(MOD_LCTL | MOD_LSFT | MOD_LALT | MOD_LGUI, kc)  // see http://brettterpstra.com/2012/12/08/a-useful-caps-lock-key/
-#define SGUI_T(kc) MT(MOD_LGUI | MOD_LSFT, kc)                        // Left Shift + GUI
+#define SGUI_T(kc) MT(MOD_LGUI | MOD_LSFT, kc)  // Left Shift + GUI
 #define SCMD_T(kc) SGUI_T(kc)
 #define SWIN_T(kc) SGUI_T(kc)
 #define LCA_T(kc) MT(MOD_LCTL | MOD_LALT, kc)  // Left Control + Alt
@@ -842,6 +780,7 @@ enum quantum_keycodes {
 #define KC_HYPR HYPR(KC_NO)
 #define KC_MEH MEH(KC_NO)
 
+// Unicode aliases
 // UNICODE_ENABLE - Allows Unicode input up to 0x7FFF
 #define UC(c) (QK_UNICODE | (c))
 // UNICODEMAP_ENABLE - Allows Unicode input up to 0x10FFFF, requires unicode_map
@@ -853,12 +792,13 @@ enum quantum_keycodes {
 
 #define UC_M_MA UNICODE_MODE_MAC
 #define UNICODE_MODE_OSX UNICODE_MODE_MAC  // Deprecated alias
-#define UC_M_OS UNICODE_MODE_MAC           // Deprecated alias
+#define UC_M_OS UNICODE_MODE_MAC  // Deprecated alias
 #define UC_M_LN UNICODE_MODE_LNX
 #define UC_M_WI UNICODE_MODE_WIN
 #define UC_M_BS UNICODE_MODE_BSD
 #define UC_M_WC UNICODE_MODE_WINC
 
+// Swap Hands
 #define SH_T(kc) (QK_SWAP_HANDS | (kc))
 #define SH_TG (QK_SWAP_HANDS | OP_SH_TOGGLE)
 #define SH_TT (QK_SWAP_HANDS | OP_SH_TAP_TOGGLE)
@@ -868,9 +808,30 @@ enum quantum_keycodes {
 #define SH_ON (QK_SWAP_HANDS | OP_SH_ON)
 #define SH_OFF (QK_SWAP_HANDS | OP_SH_OFF)
 
+// MIDI aliases
+#define MIDI_TONE_MIN MI_C
+#define MIDI_TONE_MAX MI_B_5
+#define MIDI_OCTAVE_MIN MI_OCT_N2
+#define MIDI_OCTAVE_MAX MI_OCT_7
+#define MIDI_TRANSPOSE_MIN MI_TRNS_N6
+#define MIDI_TRANSPOSE_MAX MI_TRNS_6
+#define MIDI_VELOCITY_MIN MI_VEL_0
+#define MIDI_VELOCITY_MAX MI_VEL_10
+#define MIDI_CHANNEL_MIN MI_CH1
+#define MIDI_CHANNEL_MAX MI_CH16
+
 // Dynamic Macros aliases
 #define DM_REC1 DYN_REC_START1
 #define DM_REC2 DYN_REC_START2
 #define DM_RSTP DYN_REC_STOP
 #define DM_PLY1 DYN_MACRO_PLAY1
 #define DM_PLY2 DYN_MACRO_PLAY2
+
+// Joystick aliases
+#define JS_BUTTON_MIN JS_BUTTON0
+#define JS_BUTTON_MAX JS_BUTTON31
+
+// One Shot aliases
+#define OS_TOGG ONESHOT_TOGGLE
+#define OS_ON ONESHOT_ENABLE
+#define OS_OFF ONESHOT_DISABLE
diff --git a/quantum/rgb_matrix.c b/quantum/rgb_matrix.c
index ec17b4d72..e716c6aad 100644
--- a/quantum/rgb_matrix.c
+++ b/quantum/rgb_matrix.c
@@ -26,9 +26,9 @@
 #include <lib/lib8tion/lib8tion.h>
 
 #ifndef RGB_MATRIX_CENTER
-const point_t k_rgb_matrix_center = {112, 32};
+const led_point_t k_rgb_matrix_center = {112, 32};
 #else
-const point_t k_rgb_matrix_center = RGB_MATRIX_CENTER;
+const led_point_t k_rgb_matrix_center = RGB_MATRIX_CENTER;
 #endif
 
 __attribute__((weak)) RGB rgb_matrix_hsv_to_rgb(HSV hsv) { return hsv_to_rgb(hsv); }
@@ -67,8 +67,8 @@ __attribute__((weak)) RGB rgb_matrix_hsv_to_rgb(HSV hsv) { return hsv_to_rgb(hsv
 #    define RGB_DISABLE_TIMEOUT 0
 #endif
 
-#ifndef RGB_DISABLE_WHEN_USB_SUSPENDED
-#    define RGB_DISABLE_WHEN_USB_SUSPENDED false
+#if RGB_DISABLE_WHEN_USB_SUSPENDED == false
+#    undef RGB_DISABLE_WHEN_USB_SUSPENDED
 #endif
 
 #if !defined(RGB_MATRIX_MAXIMUM_BRIGHTNESS) || RGB_MATRIX_MAXIMUM_BRIGHTNESS > UINT8_MAX
@@ -118,7 +118,6 @@ __attribute__((weak)) RGB rgb_matrix_hsv_to_rgb(HSV hsv) { return hsv_to_rgb(hsv
 #endif
 
 // globals
-bool         g_suspend_state = false;
 rgb_config_t rgb_matrix_config;  // TODO: would like to prefix this with g_ for global consistancy, do this in another pr
 uint32_t     g_rgb_timer;
 #ifdef RGB_MATRIX_FRAMEBUFFER_EFFECTS
@@ -129,9 +128,10 @@ last_hit_t g_last_hit_tracker;
 #endif  // RGB_MATRIX_KEYREACTIVE_ENABLED
 
 // internals
+static bool            suspend_state     = false;
 static uint8_t         rgb_last_enable   = UINT8_MAX;
 static uint8_t         rgb_last_effect   = UINT8_MAX;
-static effect_params_t rgb_effect_params = {0, 0xFF};
+static effect_params_t rgb_effect_params = {0, LED_FLAG_ALL, false};
 static rgb_task_states rgb_task_state    = SYNCING;
 #if RGB_DISABLE_TIMEOUT > 0
 static uint32_t rgb_anykey_timer;
@@ -143,6 +143,11 @@ static uint32_t rgb_timer_buffer;
 static last_hit_t last_hit_buffer;
 #endif  // RGB_MATRIX_KEYREACTIVE_ENABLED
 
+// split rgb matrix
+#if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+const uint8_t k_rgb_matrix_split[2] = RGB_MATRIX_SPLIT;
+#endif
+
 void eeconfig_read_rgb_matrix(void) { eeprom_read_block(&rgb_matrix_config, EECONFIG_RGB_MATRIX, sizeof(rgb_matrix_config)); }
 
 void eeconfig_update_rgb_matrix(void) { eeprom_update_block(&rgb_matrix_config, EECONFIG_RGB_MATRIX, sizeof(rgb_matrix_config)); }
@@ -153,6 +158,7 @@ void eeconfig_update_rgb_matrix_default(void) {
     rgb_matrix_config.mode   = RGB_MATRIX_STARTUP_MODE;
     rgb_matrix_config.hsv    = (HSV){RGB_MATRIX_STARTUP_HUE, RGB_MATRIX_STARTUP_SAT, RGB_MATRIX_STARTUP_VAL};
     rgb_matrix_config.speed  = RGB_MATRIX_STARTUP_SPD;
+    rgb_matrix_config.flags  = LED_FLAG_ALL;
     eeconfig_update_rgb_matrix();
 }
 
@@ -164,6 +170,7 @@ void eeconfig_debug_rgb_matrix(void) {
     dprintf("rgb_matrix_config.hsv.s = %d\n", rgb_matrix_config.hsv.s);
     dprintf("rgb_matrix_config.hsv.v = %d\n", rgb_matrix_config.hsv.v);
     dprintf("rgb_matrix_config.speed = %d\n", rgb_matrix_config.speed);
+    dprintf("rgb_matrix_config.flags = %d\n", rgb_matrix_config.flags);
 }
 
 __attribute__((weak)) uint8_t rgb_matrix_map_row_column_to_led_kb(uint8_t row, uint8_t column, uint8_t *led_i) { return 0; }
@@ -180,9 +187,22 @@ uint8_t rgb_matrix_map_row_column_to_led(uint8_t row, uint8_t column, uint8_t *l
 
 void rgb_matrix_update_pwm_buffers(void) { rgb_matrix_driver.flush(); }
 
-void rgb_matrix_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) { rgb_matrix_driver.set_color(index, red, green, blue); }
+void rgb_matrix_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+#if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    if (!is_keyboard_left() && index >= k_rgb_matrix_split[0])
+        rgb_matrix_driver.set_color(index - k_rgb_matrix_split[0], red, green, blue);
+    else if (is_keyboard_left() && index < k_rgb_matrix_split[0])
+#endif
+        rgb_matrix_driver.set_color(index, red, green, blue);
+}
 
-void rgb_matrix_set_color_all(uint8_t red, uint8_t green, uint8_t blue) { rgb_matrix_driver.set_color_all(red, green, blue); }
+void rgb_matrix_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+#if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    for (uint8_t i = 0; i < DRIVER_LED_TOTAL; i++) rgb_matrix_set_color(i, red, green, blue);
+#else
+    rgb_matrix_driver.set_color_all(red, green, blue);
+#endif
+}
 
 void process_rgb_matrix(uint8_t row, uint8_t col, bool pressed) {
 #ifndef RGB_MATRIX_SPLIT
@@ -315,6 +335,10 @@ static void rgb_task_start(void) {
 static void rgb_task_render(uint8_t effect) {
     bool rendering         = false;
     rgb_effect_params.init = (effect != rgb_last_effect) || (rgb_matrix_config.enable != rgb_last_enable);
+    if (rgb_effect_params.flags != rgb_matrix_config.flags) {
+        rgb_effect_params.flags = rgb_matrix_config.flags;
+        rgb_matrix_set_color_all(0, 0, 0);
+    }
 
     // each effect can opt to do calculations
     // and/or request PWM buffer updates.
@@ -385,14 +409,11 @@ void rgb_matrix_task(void) {
 
     // Ideally we would also stop sending zeros to the LED driver PWM buffers
     // while suspended and just do a software shutdown. This is a cheap hack for now.
-    bool suspend_backlight =
-#if RGB_DISABLE_WHEN_USB_SUSPENDED == true
-        g_suspend_state ||
-#endif  // RGB_DISABLE_WHEN_USB_SUSPENDED == true
+    bool suspend_backlight = suspend_state ||
 #if RGB_DISABLE_TIMEOUT > 0
-        (rgb_anykey_timer > (uint32_t)RGB_DISABLE_TIMEOUT) ||
+                             (rgb_anykey_timer > (uint32_t)RGB_DISABLE_TIMEOUT) ||
 #endif  // RGB_DISABLE_TIMEOUT > 0
-        false;
+                             false;
 
     uint8_t effect = suspend_backlight || !rgb_matrix_config.enable ? 0 : rgb_matrix_config.mode;
 
@@ -477,13 +498,15 @@ void rgb_matrix_init(void) {
 }
 
 void rgb_matrix_set_suspend_state(bool state) {
-    if (RGB_DISABLE_WHEN_USB_SUSPENDED && state) {
+#ifdef RGB_DISABLE_WHEN_USB_SUSPENDED
+    if (state) {
         rgb_matrix_set_color_all(0, 0, 0);  // turn off all LEDs when suspending
     }
-    g_suspend_state = state;
+    suspend_state = state;
+#endif
 }
 
-bool rgb_matrix_get_suspend_state(void) { return g_suspend_state; }
+bool rgb_matrix_get_suspend_state(void) { return suspend_state; }
 
 void rgb_matrix_toggle_eeprom_helper(bool write_to_eeprom) {
     rgb_matrix_config.enable ^= 1;
@@ -618,6 +641,6 @@ void rgb_matrix_decrease_speed_helper(bool write_to_eeprom) { rgb_matrix_set_spe
 void rgb_matrix_decrease_speed_noeeprom(void) { rgb_matrix_decrease_speed_helper(false); }
 void rgb_matrix_decrease_speed(void) { rgb_matrix_decrease_speed_helper(true); }
 
-led_flags_t rgb_matrix_get_flags(void) { return rgb_effect_params.flags; }
+led_flags_t rgb_matrix_get_flags(void) { return rgb_matrix_config.flags; }
 
-void rgb_matrix_set_flags(led_flags_t flags) { rgb_effect_params.flags = flags; }
+void rgb_matrix_set_flags(led_flags_t flags) { rgb_matrix_config.flags = flags; }
diff --git a/quantum/rgb_matrix.h b/quantum/rgb_matrix.h
index bb8bcfab6..a615b8422 100644
--- a/quantum/rgb_matrix.h
+++ b/quantum/rgb_matrix.h
@@ -216,7 +216,6 @@ extern const rgb_matrix_driver_t rgb_matrix_driver;
 
 extern rgb_config_t rgb_matrix_config;
 
-extern bool         g_suspend_state;
 extern uint32_t     g_rgb_timer;
 extern led_config_t g_led_config;
 #ifdef RGB_MATRIX_KEYREACTIVE_ENABLED
diff --git a/quantum/rgb_matrix_drivers.c b/quantum/rgb_matrix_drivers.c
index 2978e7bed..896fa6d0e 100644
--- a/quantum/rgb_matrix_drivers.c
+++ b/quantum/rgb_matrix_drivers.c
@@ -41,7 +41,28 @@ static void init(void) {
     IS31FL3731_init(DRIVER_ADDR_4);
 #        endif
 #    elif defined(IS31FL3733)
-    IS31FL3733_init(DRIVER_ADDR_1, 0);
+#        ifndef DRIVER_SYNC_1
+#            define DRIVER_SYNC_1 0
+#        endif
+    IS31FL3733_init(DRIVER_ADDR_1, DRIVER_SYNC_1);
+#        if defined DRIVER_ADDR_2 && (DRIVER_ADDR_1 != DRIVER_ADDR_2)
+#            ifndef DRIVER_SYNC_2
+#                define DRIVER_SYNC_2 0
+#            endif
+    IS31FL3733_init(DRIVER_ADDR_2, DRIVER_SYNC_2);
+#        endif
+#        ifdef DRIVER_ADDR_3
+#            ifndef DRIVER_SYNC_3
+#                define DRIVER_SYNC_3 0
+#            endif
+    IS31FL3733_init(DRIVER_ADDR_3, DRIVER_SYNC_3);
+#        endif
+#        ifdef DRIVER_ADDR_4
+#            ifndef DRIVER_SYNC_4
+#                define DRIVER_SYNC_4 0
+#            endif
+    IS31FL3733_init(DRIVER_ADDR_4, DRIVER_SYNC_4);
+#        endif
 #    elif defined(IS31FL3737)
     IS31FL3737_init(DRIVER_ADDR_1);
 #    else
@@ -74,7 +95,15 @@ static void init(void) {
 #        endif
 #    elif defined(IS31FL3733)
     IS31FL3733_update_led_control_registers(DRIVER_ADDR_1, 0);
+#        ifdef DRIVER_ADDR_2
     IS31FL3733_update_led_control_registers(DRIVER_ADDR_2, 1);
+#        endif
+#        ifdef DRIVER_ADDR_3
+    IS31FL3733_update_led_control_registers(DRIVER_ADDR_3, 2);
+#        endif
+#        ifdef DRIVER_ADDR_4
+    IS31FL3733_update_led_control_registers(DRIVER_ADDR_4, 3);
+#        endif
 #    elif defined(IS31FL3737)
     IS31FL3737_update_led_control_registers(DRIVER_ADDR_1, DRIVER_ADDR_2);
 #    else
@@ -105,7 +134,15 @@ const rgb_matrix_driver_t rgb_matrix_driver = {
 #    elif defined(IS31FL3733)
 static void flush(void) {
     IS31FL3733_update_pwm_buffers(DRIVER_ADDR_1, 0);
+#        ifdef DRIVER_ADDR_2
     IS31FL3733_update_pwm_buffers(DRIVER_ADDR_2, 1);
+#        endif
+#        ifdef DRIVER_ADDR_3
+    IS31FL3733_update_pwm_buffers(DRIVER_ADDR_3, 2);
+#        endif
+#        ifdef DRIVER_ADDR_4
+    IS31FL3733_update_pwm_buffers(DRIVER_ADDR_4, 3);
+#        endif
 }
 
 const rgb_matrix_driver_t rgb_matrix_driver = {
diff --git a/quantum/rgb_matrix_types.h b/quantum/rgb_matrix_types.h
index 7b8171fb2..df575d657 100644
--- a/quantum/rgb_matrix_types.h
+++ b/quantum/rgb_matrix_types.h
@@ -62,7 +62,7 @@ typedef struct PACKED {
 typedef struct PACKED {
     uint8_t x;
     uint8_t y;
-} point_t;
+} led_point_t;
 
 #define HAS_FLAGS(bits, flags) ((bits & flags) == flags)
 #define HAS_ANY_FLAGS(bits, flags) ((bits & flags) != 0x00)
@@ -77,18 +77,19 @@ typedef struct PACKED {
 #define NO_LED 255
 
 typedef struct PACKED {
-    uint8_t matrix_co[MATRIX_ROWS][MATRIX_COLS];
-    point_t point[DRIVER_LED_TOTAL];
-    uint8_t flags[DRIVER_LED_TOTAL];
+    uint8_t     matrix_co[MATRIX_ROWS][MATRIX_COLS];
+    led_point_t point[DRIVER_LED_TOTAL];
+    uint8_t     flags[DRIVER_LED_TOTAL];
 } led_config_t;
 
 typedef union {
     uint32_t raw;
     struct PACKED {
-        uint8_t enable : 2;
-        uint8_t mode : 6;
-        HSV     hsv;
-        uint8_t speed;  // EECONFIG needs to be increased to support this
+        uint8_t     enable : 2;
+        uint8_t     mode : 6;
+        HSV         hsv;
+        uint8_t     speed;  // EECONFIG needs to be increased to support this
+        led_flags_t flags;
     };
 } rgb_config_t;
 
diff --git a/quantum/rgblight.c b/quantum/rgblight.c
index 119d3eab2..baa10ec41 100644
--- a/quantum/rgblight.c
+++ b/quantum/rgblight.c
@@ -722,23 +722,39 @@ static void rgblight_layers_write(void) {
 }
 
 #    ifdef RGBLIGHT_LAYER_BLINK
-rgblight_layer_mask_t _blinked_layer_mask = 0;
-static uint16_t       _blink_timer;
+rgblight_layer_mask_t _blinking_layer_mask = 0;
+static uint16_t       _repeat_timer;
+static uint8_t        _times_remaining;
+static uint16_t       _dur;
+
+void rgblight_blink_layer(uint8_t layer, uint16_t duration_ms) { rgblight_blink_layer_repeat(layer, duration_ms, 1); }
+
+void rgblight_blink_layer_repeat(uint8_t layer, uint16_t duration_ms, uint8_t times) {
+    _times_remaining = times * 2;
+    _dur             = duration_ms;
 
-void rgblight_blink_layer(uint8_t layer, uint16_t duration_ms) {
     rgblight_set_layer_state(layer, true);
-    _blinked_layer_mask |= (rgblight_layer_mask_t)1 << layer;
-    _blink_timer = sync_timer_read() + duration_ms;
+    _times_remaining--;
+    _blinking_layer_mask |= (rgblight_layer_mask_t)1 << layer;
+    _repeat_timer = sync_timer_read() + duration_ms;
 }
 
-void rgblight_unblink_layers(void) {
-    if (_blinked_layer_mask != 0 && timer_expired(sync_timer_read(), _blink_timer)) {
+void rgblight_blink_layer_repeat_helper(void) {
+    if (_blinking_layer_mask != 0 && timer_expired(sync_timer_read(), _repeat_timer)) {
         for (uint8_t layer = 0; layer < RGBLIGHT_MAX_LAYERS; layer++) {
-            if ((_blinked_layer_mask & (rgblight_layer_mask_t)1 << layer) != 0) {
-                rgblight_set_layer_state(layer, false);
+            if ((_blinking_layer_mask & (rgblight_layer_mask_t)1 << layer) != 0 && _times_remaining > 0) {
+                if (_times_remaining % 2 == 1) {
+                    rgblight_set_layer_state(layer, false);
+                } else {
+                    rgblight_set_layer_state(layer, true);
+                }
+                _times_remaining--;
+                _repeat_timer = sync_timer_read() + _dur;
             }
         }
-        _blinked_layer_mask = 0;
+        if (_times_remaining <= 0) {
+            _blinking_layer_mask = 0;
+        }
     }
 }
 #    endif
@@ -755,8 +771,8 @@ void rgblight_suspend(void) {
 
 #    ifdef RGBLIGHT_LAYER_BLINK
         // make sure any layer blinks don't come back after suspend
-        rgblight_status.enabled_layer_mask &= ~_blinked_layer_mask;
-        _blinked_layer_mask = 0;
+        rgblight_status.enabled_layer_mask &= ~_blinking_layer_mask;
+        _blinking_layer_mask = 0;
 #    endif
 
         rgblight_disable_noeeprom();
@@ -874,7 +890,7 @@ void rgblight_update_sync(rgblight_syncinfo_t *syncinfo, bool write_to_eeprom) {
         animation_status.restart = true;
     }
 #        endif /* RGBLIGHT_SPLIT_NO_ANIMATION_SYNC */
-#    endif     /* RGBLIGHT_USE_TIMER */
+#    endif /* RGBLIGHT_USE_TIMER */
 }
 #endif /* RGBLIGHT_SPLIT */
 
@@ -1030,7 +1046,7 @@ void rgblight_task(void) {
     }
 
 #    ifdef RGBLIGHT_LAYER_BLINK
-    rgblight_unblink_layers();
+    rgblight_blink_layer_repeat_helper();
 #    endif
 }
 
diff --git a/quantum/rgblight.h b/quantum/rgblight.h
index 6fb3ab938..bec2c6695 100644
--- a/quantum/rgblight.h
+++ b/quantum/rgblight.h
@@ -222,6 +222,7 @@ extern const rgblight_segment_t *const *rgblight_layers;
 #        ifdef RGBLIGHT_LAYER_BLINK
 #            define RGBLIGHT_USE_TIMER
 void rgblight_blink_layer(uint8_t layer, uint16_t duration_ms);
+void rgblight_blink_layer_repeat(uint8_t layer, uint16_t duration_ms, uint8_t times);
 #        endif
 
 #    endif
diff --git a/quantum/split_common/matrix.c b/quantum/split_common/matrix.c
index d6636b886..039e7d977 100644
--- a/quantum/split_common/matrix.c
+++ b/quantum/split_common/matrix.c
@@ -43,6 +43,7 @@ extern matrix_row_t matrix[MATRIX_ROWS];      // debounced values
 uint8_t thisHand, thatHand;
 
 // user-defined overridable functions
+__attribute__((weak)) void matrix_slave_scan_kb(void) { matrix_slave_scan_user(); }
 __attribute__((weak)) void matrix_slave_scan_user(void) {}
 
 static inline void setPinOutput_writeLow(pin_t pin) {
@@ -129,9 +130,7 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 
     // Unselect row
     unselect_row(current_row);
-    if (current_row + 1 < MATRIX_ROWS) {
-        matrix_output_unselect_delay();  // wait for row signal to go HIGH
-    }
+    matrix_output_unselect_delay();  // wait for all Col signals to go HIGH
 
     // If the row has changed, store the row and return the changed flag.
     if (current_matrix[current_row] != current_row_value) {
@@ -191,9 +190,7 @@ static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
 
     // Unselect col
     unselect_col(current_col);
-    if (current_col + 1 < MATRIX_COLS) {
-        matrix_output_unselect_delay();  // wait for col signal to go HIGH
-    }
+    matrix_output_unselect_delay();  // wait for all Row signals to go HIGH
 
     return matrix_changed;
 }
@@ -284,7 +281,7 @@ bool matrix_post_scan(void) {
     } else {
         transport_slave(matrix + thatHand, matrix + thisHand);
 
-        matrix_slave_scan_user();
+        matrix_slave_scan_kb();
     }
 
     return changed;
diff --git a/quantum/split_common/split_util.c b/quantum/split_common/split_util.c
index 2ae44e6e1..9e75e19ce 100644
--- a/quantum/split_common/split_util.c
+++ b/quantum/split_common/split_util.c
@@ -1,3 +1,18 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
 #include "split_util.h"
 #include "matrix.h"
 #include "keyboard.h"
@@ -6,14 +21,7 @@
 #include "transport.h"
 #include "quantum.h"
 #include "wait.h"
-
-#ifdef PROTOCOL_LUFA
-#    include <LUFA/Drivers/USB/USB.h>
-#endif
-
-#ifdef PROTOCOL_VUSB
-#    include <usbdrv/usbdrv.h>
-#endif
+#include "usb_util.h"
 
 #ifdef EE_HANDS
 #    include "eeconfig.h"
@@ -31,56 +39,21 @@
 #    define SPLIT_USB_TIMEOUT_POLL 10
 #endif
 
-#ifdef PROTOCOL_CHIBIOS
-#    define SPLIT_USB_DETECT  // Force this on for now
-#endif
-
 volatile bool isLeftHand = true;
 
 #if defined(SPLIT_USB_DETECT)
-#    if defined(PROTOCOL_LUFA)
-static inline bool usbHasActiveConnection(void) { return USB_Device_IsAddressSet(); }
-static inline void usbDisable(void) {
-    USB_Disable();
-    USB_DeviceState = DEVICE_STATE_Unattached;
-}
-#    elif defined(PROTOCOL_CHIBIOS)
-static inline bool usbHasActiveConnection(void) { return usbGetDriverStateI(&USBD1) == USB_ACTIVE; }
-static inline void usbDisable(void) { usbStop(&USBD1); }
-#    elif defined(PROTOCOL_VUSB)
-static inline bool usbHasActiveConnection(void) {
-    usbPoll();
-    return usbConfiguration;
-}
-static inline void usbDisable(void) { usbDeviceDisconnect(); }
-#    else
-static inline bool usbHasActiveConnection(void) { return true; }
-static inline void usbDisable(void) {}
-#    endif
-
-bool usbIsActive(void) {
+static bool usbIsActive(void) {
     for (uint8_t i = 0; i < (SPLIT_USB_TIMEOUT / SPLIT_USB_TIMEOUT_POLL); i++) {
         // This will return true if a USB connection has been established
-        if (usbHasActiveConnection()) {
+        if (usb_connected_state()) {
             return true;
         }
         wait_ms(SPLIT_USB_TIMEOUT_POLL);
     }
-
-    // Avoid NO_USB_STARTUP_CHECK - Disable USB as the previous checks seem to enable it somehow
-    usbDisable();
-
     return false;
 }
-#elif defined(PROTOCOL_LUFA) && defined(OTGPADE)
-static inline bool usbIsActive(void) {
-    USB_OTGPAD_On();  // enables VBUS pad
-    wait_us(5);
-
-    return USB_VBUS_GetStatus();  // checks state of VBUS
-}
 #else
-static inline bool usbIsActive(void) { return true; }
+static inline bool usbIsActive(void) { return usb_vbus_state(); }
 #endif
 
 #ifdef SPLIT_HAND_MATRIX_GRID
@@ -126,6 +99,11 @@ __attribute__((weak)) bool is_keyboard_master(void) {
     // only check once, as this is called often
     if (usbstate == UNKNOWN) {
         usbstate = usbIsActive() ? MASTER : SLAVE;
+
+        // Avoid NO_USB_STARTUP_CHECK - Disable USB as the previous checks seem to enable it somehow
+        if (usbstate == SLAVE) {
+            usb_disable();
+        }
     }
 
     return (usbstate == MASTER);
diff --git a/quantum/split_common/transport.c b/quantum/split_common/transport.c
index 61b61ea08..9ed0f7591 100644
--- a/quantum/split_common/transport.c
+++ b/quantum/split_common/transport.c
@@ -22,6 +22,13 @@ static pin_t encoders_pad[] = ENCODERS_PAD_A;
 #    define NUMBER_OF_ENCODERS (sizeof(encoders_pad) / sizeof(pin_t))
 #endif
 
+#if defined(LED_MATRIX_ENABLE) && defined(LED_MATRIX_SPLIT)
+#    include "led_matrix.h"
+#endif
+#if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+#    include "rgb_matrix.h"
+#endif
+
 #if defined(USE_I2C)
 
 #    include "i2c_master.h"
@@ -54,6 +61,14 @@ typedef struct _I2C_slave_buffer_t {
 #    ifdef WPM_ENABLE
     uint8_t current_wpm;
 #    endif
+#    if defined(LED_MATRIX_ENABLE) && defined(LED_MATRIX_SPLIT)
+    led_eeconfig_t led_matrix;
+    bool           led_suspend_state;
+#    endif
+#    if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    rgb_config_t rgb_matrix;
+    bool         rgb_suspend_state;
+#    endif
 } I2C_slave_buffer_t;
 
 static I2C_slave_buffer_t *const i2c_buffer = (I2C_slave_buffer_t *)i2c_slave_reg;
@@ -68,6 +83,10 @@ static I2C_slave_buffer_t *const i2c_buffer = (I2C_slave_buffer_t *)i2c_slave_re
 #    define I2C_RGB_START offsetof(I2C_slave_buffer_t, rgblight_sync)
 #    define I2C_ENCODER_START offsetof(I2C_slave_buffer_t, encoder_state)
 #    define I2C_WPM_START offsetof(I2C_slave_buffer_t, current_wpm)
+#    define I2C_LED_MATRIX_START offsetof(I2C_slave_buffer_t, led_matrix)
+#    define I2C_LED_SUSPEND_START offsetof(I2C_slave_buffer_t, led_suspend_state)
+#    define I2C_RGB_MATRIX_START offsetof(I2C_slave_buffer_t, rgb_matrix)
+#    define I2C_RGB_SUSPEND_START offsetof(I2C_slave_buffer_t, rgb_suspend_state)
 
 #    define TIMEOUT 100
 
@@ -141,6 +160,17 @@ bool transport_master(matrix_row_t master_matrix[], matrix_row_t slave_matrix[])
 #        endif
 #    endif
 
+#    if defined(LED_MATRIX_ENABLE) && defined(LED_MATRIX_SPLIT)
+    i2c_writeReg(SLAVE_I2C_ADDRESS, I2C_LED_MATRIX_START, (void *)led_matrix_eeconfig, sizeof(i2c_buffer->led_matrix), TIMEOUT);
+    bool suspend_state = led_matrix_get_suspend_state();
+    i2c_writeReg(SLAVE_I2C_ADDRESS, I2C_LED_SUSPEND_START, (void *)suspend_state, sizeof(i2c_buffer->led_suspend_state), TIMEOUT);
+#    endif
+#    if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    i2c_writeReg(SLAVE_I2C_ADDRESS, I2C_RGB_MATRIX_START, (void *)rgb_matrix_config, sizeof(i2c_buffer->rgb_matrix), TIMEOUT);
+    bool suspend_state = rgb_matrix_get_suspend_state();
+    i2c_writeReg(SLAVE_I2C_ADDRESS, I2C_RGB_SUSPEND_START, (void *)suspend_state, sizeof(i2c_buffer->rgb_suspend_state), TIMEOUT);
+#    endif
+
 #    ifndef DISABLE_SYNC_TIMER
     i2c_buffer->sync_timer = sync_timer_read32() + SYNC_TIMER_OFFSET;
     i2c_writeReg(SLAVE_I2C_ADDRESS, I2C_SYNC_TIME_START, (void *)&i2c_buffer->sync_timer, sizeof(i2c_buffer->sync_timer), TIMEOUT);
@@ -186,6 +216,15 @@ void transport_slave(matrix_row_t master_matrix[], matrix_row_t slave_matrix[])
     set_oneshot_mods(i2c_buffer->oneshot_mods);
 #        endif
 #    endif
+
+#    if defined(LED_MATRIX_ENABLE) && defined(LED_MATRIX_SPLIT)
+    memcpy((void *)i2c_buffer->led_matrix, (void *)led_matrix_eeconfig, sizeof(i2c_buffer->led_matrix));
+    led_matrix_set_suspend_state(i2c_buffer->led_suspend_state);
+#    endif
+#    if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    memcpy((void *)i2c_buffer->rgb_matrix, (void *)rgb_matrix_config, sizeof(i2c_buffer->rgb_matrix));
+    rgb_matrix_set_suspend_state(i2c_buffer->rgb_suspend_state);
+#    endif
 }
 
 void transport_master_init(void) { i2c_init(); }
@@ -201,30 +240,38 @@ typedef struct _Serial_s2m_buffer_t {
     matrix_row_t smatrix[ROWS_PER_HAND];
 
 #    ifdef ENCODER_ENABLE
-    uint8_t      encoder_state[NUMBER_OF_ENCODERS];
+    uint8_t encoder_state[NUMBER_OF_ENCODERS];
 #    endif
 
 } Serial_s2m_buffer_t;
 
 typedef struct _Serial_m2s_buffer_t {
 #    ifdef SPLIT_MODS_ENABLE
-    uint8_t      real_mods;
-    uint8_t      weak_mods;
+    uint8_t real_mods;
+    uint8_t weak_mods;
 #        ifndef NO_ACTION_ONESHOT
-    uint8_t      oneshot_mods;
+    uint8_t oneshot_mods;
 #        endif
 #    endif
 #    ifndef DISABLE_SYNC_TIMER
-    uint32_t     sync_timer;
+    uint32_t sync_timer;
 #    endif
 #    ifdef SPLIT_TRANSPORT_MIRROR
     matrix_row_t mmatrix[ROWS_PER_HAND];
 #    endif
 #    ifdef BACKLIGHT_ENABLE
-    uint8_t      backlight_level;
+    uint8_t backlight_level;
 #    endif
 #    ifdef WPM_ENABLE
-    uint8_t      current_wpm;
+    uint8_t current_wpm;
+#    endif
+#    if defined(LED_MATRIX_ENABLE) && defined(LED_MATRIX_SPLIT)
+    led_eeconfig_t led_matrix;
+    bool           led_suspend_state;
+#    endif
+#    if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    rgb_config_t rgb_matrix;
+    bool         rgb_suspend_state;
 #    endif
 } Serial_m2s_buffer_t;
 
@@ -316,7 +363,7 @@ bool transport_master(matrix_row_t master_matrix[], matrix_row_t slave_matrix[])
 
     // TODO:  if MATRIX_COLS > 8 change to unpack()
     for (int i = 0; i < ROWS_PER_HAND; ++i) {
-        slave_matrix[i]              = serial_s2m_buffer.smatrix[i];
+        slave_matrix[i] = serial_s2m_buffer.smatrix[i];
 #    ifdef SPLIT_TRANSPORT_MIRROR
         serial_m2s_buffer.mmatrix[i] = master_matrix[i];
 #    endif
@@ -333,18 +380,28 @@ bool transport_master(matrix_row_t master_matrix[], matrix_row_t slave_matrix[])
 
 #    ifdef WPM_ENABLE
     // Write wpm to slave
-    serial_m2s_buffer.current_wpm  = get_current_wpm();
+    serial_m2s_buffer.current_wpm = get_current_wpm();
 #    endif
 
 #    ifdef SPLIT_MODS_ENABLE
-    serial_m2s_buffer.real_mods    = get_mods();
-    serial_m2s_buffer.weak_mods    = get_weak_mods();
+    serial_m2s_buffer.real_mods = get_mods();
+    serial_m2s_buffer.weak_mods = get_weak_mods();
 #        ifndef NO_ACTION_ONESHOT
     serial_m2s_buffer.oneshot_mods = get_oneshot_mods();
 #        endif
 #    endif
+
+#    if defined(LED_MATRIX_ENABLE) && defined(LED_MATRIX_SPLIT)
+    serial_m2s_buffer.led_matrix        = led_matrix_eeconfig;
+    serial_m2s_buffer.led_suspend_state = led_matrix_get_suspend_state();
+#    endif
+#    if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    serial_m2s_buffer.rgb_matrix        = rgb_matrix_config;
+    serial_m2s_buffer.rgb_suspend_state = rgb_matrix_get_suspend_state();
+#    endif
+
 #    ifndef DISABLE_SYNC_TIMER
-    serial_m2s_buffer.sync_timer   = sync_timer_read32() + SYNC_TIMER_OFFSET;
+    serial_m2s_buffer.sync_timer = sync_timer_read32() + SYNC_TIMER_OFFSET;
 #    endif
     return true;
 }
@@ -359,7 +416,7 @@ void transport_slave(matrix_row_t master_matrix[], matrix_row_t slave_matrix[])
     for (int i = 0; i < ROWS_PER_HAND; ++i) {
         serial_s2m_buffer.smatrix[i] = slave_matrix[i];
 #    ifdef SPLIT_TRANSPORT_MIRROR
-        master_matrix[i]             = serial_m2s_buffer.mmatrix[i];
+        master_matrix[i] = serial_m2s_buffer.mmatrix[i];
 #    endif
     }
 #    ifdef BACKLIGHT_ENABLE
@@ -381,6 +438,15 @@ void transport_slave(matrix_row_t master_matrix[], matrix_row_t slave_matrix[])
     set_oneshot_mods(serial_m2s_buffer.oneshot_mods);
 #        endif
 #    endif
+
+#    if defined(LED_MATRIX_ENABLE) && defined(LED_MATRIX_SPLIT)
+    led_matrix_eeconfig = serial_m2s_buffer.led_matrix;
+    led_matrix_set_suspend_state(serial_m2s_buffer.led_suspend_state);
+#    endif
+#    if defined(RGB_MATRIX_ENABLE) && defined(RGB_MATRIX_SPLIT)
+    rgb_matrix_config = serial_m2s_buffer.rgb_matrix;
+    rgb_matrix_set_suspend_state(serial_m2s_buffer.rgb_suspend_state);
+#    endif
 }
 
 #endif
diff --git a/quantum/wpm.c b/quantum/wpm.c
index da30bd252..bec419a48 100644
--- a/quantum/wpm.c
+++ b/quantum/wpm.c
@@ -19,11 +19,10 @@
 
 // WPM Stuff
 static uint8_t  current_wpm = 0;
-static uint8_t  latest_wpm  = 0;
 static uint16_t wpm_timer   = 0;
 
 // This smoothing is 40 keystrokes
-static const float wpm_smoothing = 0.0487;
+static const float wpm_smoothing = WPM_SMOOTHING;
 
 void set_current_wpm(uint8_t new_wpm) { current_wpm = new_wpm; }
 
@@ -46,19 +45,46 @@ __attribute__((weak)) bool wpm_keycode_user(uint16_t keycode) {
     return false;
 }
 
+#ifdef WPM_ALLOW_COUNT_REGRESSION
+__attribute__((weak)) uint8_t wpm_regress_count(uint16_t keycode) {
+    bool weak_modded = (keycode >= QK_LCTL && keycode < QK_LSFT) || (keycode >= QK_RCTL && keycode < QK_RSFT);
+
+    if ((keycode >= QK_MOD_TAP && keycode <= QK_MOD_TAP_MAX) || (keycode >= QK_LAYER_TAP && keycode <= QK_LAYER_TAP_MAX) || (keycode >= QK_MODS && keycode <= QK_MODS_MAX)) {
+        keycode = keycode & 0xFF;
+    } else if (keycode > 0xFF) {
+        keycode = 0;
+    }
+    if (keycode == KC_DEL || keycode == KC_BSPC) {
+        if (((get_mods() | get_oneshot_mods()) & MOD_MASK_CTRL) || weak_modded) {
+            return WPM_ESTIMATED_WORD_SIZE;
+        } else {
+            return 1;
+        }
+    } else {
+        return 0;
+    }
+}
+#endif
+
 void update_wpm(uint16_t keycode) {
     if (wpm_keycode(keycode)) {
         if (wpm_timer > 0) {
-            latest_wpm  = 60000 / timer_elapsed(wpm_timer) / 5;
-            current_wpm = (latest_wpm - current_wpm) * wpm_smoothing + current_wpm;
+            current_wpm += ((60000 / timer_elapsed(wpm_timer) / WPM_ESTIMATED_WORD_SIZE) - current_wpm) * wpm_smoothing;
         }
         wpm_timer = timer_read();
     }
+#ifdef WPM_ALLOW_COUNT_REGRESSION
+    uint8_t regress = wpm_regress_count(keycode);
+    if (regress) {
+        current_wpm -= regress;
+        wpm_timer = timer_read();
+    }
+#endif
 }
 
 void decay_wpm(void) {
     if (timer_elapsed(wpm_timer) > 1000) {
-        current_wpm = (0 - current_wpm) * wpm_smoothing + current_wpm;
-        wpm_timer   = timer_read();
+        current_wpm += (-current_wpm) * wpm_smoothing;
+        wpm_timer = timer_read();
     }
 }
diff --git a/quantum/wpm.h b/quantum/wpm.h
index 15ab4ffcd..4af52d2b9 100644
--- a/quantum/wpm.h
+++ b/quantum/wpm.h
@@ -19,10 +19,21 @@
 
 #include "quantum.h"
 
+#ifndef WPM_ESTIMATED_WORD_SIZE
+#    define WPM_ESTIMATED_WORD_SIZE 5
+#endif
+#ifndef WPM_SMOOTHING
+#    define WPM_SMOOTHING 0.0487
+#endif
+
 bool wpm_keycode(uint16_t keycode);
 bool wpm_keycode_kb(uint16_t keycode);
 bool wpm_keycode_user(uint16_t keycode);
 
+#ifdef WPM_ALLOW_COUNT_REGRESSION
+uint8_t wpm_regress_count(uint16_t keycode);
+#endif
+
 void    set_current_wpm(uint8_t);
 uint8_t get_current_wpm(void);
 void    update_wpm(uint16_t);