/// @description Down

switch(slider_id) {
case SLIDER.SOUND:
	gpsound_volume = max(gpsound_volume - 0.1, 0);
	audio_emitter_gain(gpsound_emitter, gpsound_volume);
	val = gpsound_volume;
	break;
case SLIDER.MUSIC:
	gpmusic_volume = max(gpmusic_volume - 0.1, 0);
	audio_emitter_gain(gpmusic_emitter, gpmusic_volume);
	if (gpmusic_volume == 0)
		audio_stop_sound(global.music_current);
	val = gpmusic_volume;
	break;
}