The few times that I've done this sort of thing (snipped off a buzzer), the buzzer in question wasn't a speaker with an outwardly accessible speaker cone that I could muffle. It was a piezoelectric buzzer mounted somewhere deep inside the casing of the device, loud enough to be irritating even when buried deep inside the plastic or metal casing. That was the situation with my dryer machine, and I'll bet it's the same with pretty much every dryer with a buzzer.