The Opamp version of the Big Muff Pi was made famous by many guitarists and featured on countless recordings, among them Siamese Dream by Smashing Pumpkins. The circuit relies on op-amps rather than transistors and three gain stages rather than four, to create its signature sound. It’s a sound that’s been described by noted Big Muff collector and historian, Kit Rae, as: “a huge, crushing Big Muff sound with more crunch… great for grungy, wall-of-sound distortion, heavy rhythm playing and heavy leads.”
