Any object used for making sound offerings can be blessed by recitation of OM PADMO USHNISHA BIMALE HUM PHAT seven times and by the breath [blowing on the instrument.] Then for whoever hears that sound, the five heinous crimes [and lighter negative actions] are purified. This applies even to drums and bells, even though the advice was given by Domo Geshe Rinpoche in relation to small cymbals. In actuality, it applies to any sound.