The NYC original. The USA Big Muff Pi is the distortion that Hendrix and Santana, up to the top contemporary guitarists and rock legends, rely on for its rich, creamy, violin-like sustain. A timeless piece, the Big Muff Pi has been defining the sound of rock guitar for almost 40 years. From Pink Floyd to The White Stripes, everyone wants a piece of the Pi! Quick Specs: • True bypass • Singing sustain with attitude • Crushing distortion • Adjustable tone • 9-volt battery included • Optional 9DC-100 power supply available