private void changeMusicVol(float delta) {
		float volume = music.getVolume();
		switch (musicState) {
			case 1:
				if (music.isLooping() || music.isPlaying()) {
					if (volume > 0.10f)
						volume -= delta;
					else {
						changeToMainMenu();
					}
					music.setVolume(Math.abs(volume));
				}
				break;
			case 0:
				if (music.isLooping() || music.isPlaying()) {
					if (volume < 1.0f)
						volume += delta * 3;
					else {
						volume = 1.0f;
					}
					music.setVolume(volume);
				}
				break;
		}
	}