Originally released in 1970, the Electro-Harmonix Big Muff is a classic fuzz pedal, as used by Jimi Hendrix, Carlos Santana and David Gilmour. This is a recreation of the Op-Amp version, from the late-seventies, made popular by Smashing Pumpkins on their ‘Siamese Dream’ album. It’s VERY fuzzy, and VERY cool sounding!