qmk_firmware_custom/keyboards/crkbd/rev1/rev1.c

#include "crkbd.h"


#ifdef AUDIO_ENABLE
    float tone_startup[][2] = SONG(STARTUP_SOUND);
    float tone_goodbye[][2] = SONG(GOODBYE_SOUND);
#endif

#ifdef SSD1306OLED
void led_set_kb(uint8_t usb_led) {
    // put your keyboard LED indicator (ex: Caps Lock LED) toggling code here
    //led_set_user(usb_led);
}
#endif

void matrix_init_kb(void) {

    #ifdef AUDIO_ENABLE
        _delay_ms(20); // gets rid of tick
        PLAY_SONG(tone_startup);
    #endif

	matrix_init_user();
};

void shutdown_kb(void) {
    #ifdef AUDIO_ENABLE
        PLAY_SONG(tone_goodbye);
      	_delay_ms(150);
      	stop_all_notes();
    #endif
}