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How do you turn the sound of on the wii controller while playing Guitar Hero 3?

When im playing guitar hero 3 on the wii, every time i mess up it makes an anoying sound, it ruins the sound of the song and its loud and makes people in the other room made cause im not the best player so it makes the sound alot, especialy on hard. How on earth do i shut the thing up, do i do it in the in game settings or do i go to the wii system setings. Thanks

1.Press home on wiimote
2.Press icon of wiimote
3.adjust volume