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electro-harmonix Big Muff Pi - Effects Pedals
78 Electro Harmonix Op Amp Big Muff π - V4 (EH 1322) – Found Sound
Billy Corgan's Muff pic! What version is it?! – Electro-Harmonix
Electro-Harmonix "Op-Amp" Big Muff Pi V4 - ranked #281 in Fuzz Pedals | Equipboard
Billy Corgan shows off some some of his pedal collection! –
Mike, Billy, and the Op-Amp Big Muff Pi - Electro-Harmonix
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Ronsound Hairpie Classic Triangle ultimate vintage big muff replica overdive-fuzz 2007 Billy Corgan | Reverb Italia
Billy Corgan's First Look at the Op Amp Big Muff from Electro-Harmonix | Reverb Interview - YouTube
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Billy Corgan Demos the EHX Op Amp Big Muff | Reverb Interview | After putting the original to such memorable use on Siamese Dream, who better to demo the newly announced Op
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