qmk_firmware/keyboards/preonic/keymaps/shwilliam/config.h

#pragma once

#ifdef AUDIO_ENABLE
    #define STARTUP_SONG SONG(PREONIC_SOUND)
    // #define STARTUP_SONG SONG(NO_SOUND)
#endif

#define MUSIC_MASK (keycode != KC_NO)

#define MIDI_BASIC

/* enable advanced MIDI features */
//#define MIDI_ADVANCED

/* override number of MIDI tone keycodes (each octave adds 12 keycodes and allocates 12 bytes) */
//#define MIDI_TONE_KEYCODE_OCTAVES 2