qmk_firmware/quantum/process_keycode/process_audio.h

#pragma once

#include <stdint.h>
#include <stdbool.h>
#include "action.h"

float compute_freq_for_midi_note(uint8_t note);

bool process_audio(uint16_t keycode, keyrecord_t *record);
void process_audio_noteon(uint8_t note);
void process_audio_noteoff(uint8_t note);
void process_audio_all_notes_off(void);