Electro-Harmonix OP AMP BIG MUFF Pi Distortion/Sustain PedalThe Electro Harmonix Op Amp Big Muff is a reissue of a classic fuzz pedal from the 1970s. It aims to give you the iconic and sustaining distortion of that era. Three main controls are at your disposal including a volume knob for overall level, a tone knob to shape your timbre, and of course the fuzz knob with which you can introduce sweet distortion into your signal. The original pedal relied on op amps rather than transistors to achieve its