The radios that I've used in recent years don't have a squelch control or squelch override button.
Silsoesid, in short. There is no squelch on the aircraft I fly. So despite being one of those spiky haired iCadets everyone hates so much, yes I do know from a previous type how to use squelch, unfortunately I cannot.
Airbubba & RHS, if you don't mind me asking, which radios do you use?