The name expression pedal comes from the electronic organ, (Which is why you seldom see a volume pedal mentioned in electronic organ specs (They normally also have 2 switches on them) whereas other instruments just call them volume pedals. (And don’t usually have switches on)
Regards
Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).