Electro-Harmonix Nano Big Muff Pi

From EHX:
The Nano Big Muff Pi works and sounds identical in every way to the classic NYC Big Muff Pi. Electro Harmonix took the Big Muff circuit and simply shrunk it without changing its rich sustain and legendary sound. For over 40 years, the Big Muff Pi has helped define the sound of rock guitar. Three flexible yet powerful controls let you dial in the perfect sound. Crank the Volume to bring on the distortion while the Tone knob focuses on sonic color and the Sustain control unleashes a powerful, silky, singing tone.

Revered by contemporary guitarists and rock legends alike for its rich, creamy, violin-like sustain, everyone wants a piece of the Pi. Now you can have it in the time-honored classic chassis, or the new, compact nano design.