Split MIDI functionality into MIDI_BASIC and MIDI_ADVANCED

MIDI_ENABLE = no

   text	   data	    bss	    dec	    hex	filename
      0	  17080	      0	  17080	   42b8	satan_midi.hex

MIDI_ENABLE = yes
MIDI_BASIC undefined
MIDI_ADVANCED undefined

   text	   data	    bss	    dec	    hex	filename
      0	  19494	      0	  19494	   4c26	satan_midi.hex

MIDI_ENABLE = yes
#define MIDI_BASIC
MIDI_ADVANCED undefined

   text	   data	    bss	    dec	    hex	filename
      0	  19788	      0	  19788	   4d4c	satan_midi.hex

MIDI_ENABLE = yes
MIDI_BASIC undefined
#define MIDI_ADVANCED

   text	   data	    bss	    dec	    hex	filename
      0	  20846	      0	  20846	   516e	satan_midi.hex

MIDI_ENABLE = yes
#define MIDI_BASIC
#define MIDI_ADVANCED

   text	   data	    bss	    dec	    hex	filename
      0	  21140	      0	  21140	   5294	satan_midi.hex

1 files changed, 1 insertions, 0 deletions

diff --git a/build_keyboard.mk b/build_keyboard.mk
index 4a6fc0980..eea8d5919 100644
--- a/build_keyboard.mk
+++ b/build_keyboard.mk
@@ -141,6 +141,7 @@ endif
 
 ifeq ($(strip $(MIDI_ENABLE)), yes)
     OPT_DEFS += -DMIDI_ENABLE
+        SRC += $(QUANTUM_DIR)/process_keycode/process_music.c
         SRC += $(QUANTUM_DIR)/process_keycode/process_midi.c
 endif