adds option for alt pitch standards

1 files changed, 5 insertions, 1 deletions

diff --git a/quantum/process_keycode/process_audio.c b/quantum/process_keycode/process_audio.c
index eb74796fa..32057ae8d 100644
--- a/quantum/process_keycode/process_audio.c
+++ b/quantum/process_keycode/process_audio.c
@@ -6,10 +6,14 @@
 #endif
 float voice_change_song[][2] = VOICE_CHANGE_SONG;
 
+#ifndef PITCH_STANDARD_A
+    #define PITCH_STANDARD_A 440.0f
+#endif
+
 static float compute_freq_for_midi_note(uint8_t note)
 {
     // https://en.wikipedia.org/wiki/MIDI_tuning_standard
-    return pow(2.0, (note - 69) / 12.0) * 440.0f;
+    return pow(2.0, (note - 69) / 12.0) * PITCH_STANDARD_A;
 }
 
 bool process_audio(uint16_t keycode, keyrecord_t *record) {