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Electro-Harmonix Big Muff PI Russian Big Muff Pi The pedal that started it all! The distortion that countless musicians such as Hendrix and Santana relied on for its rich, creamy, violin-like sustain. A timeless piece, the Big Muff has been defining the sound of rock guitar for the past 30 years. From Pink Floyd to the Chemical Brothers to Korn, everyone wants a piece of the 'Pi! Currently Out Of Stock