Electro-Harmonix NANO BIG MUFF Pi Distortion/Sustain PedalWe took the Big Muff Pi circuit and simply shrunk it without changing its rich, creamy, violin like sustain and sound. The Nano Big Muff Pi works and sounds identical in every way to our classic NYC Big Muff Pi. Get a piece of the pi for yourself! FEATURES Crushing distortion Singing sustain with attitude Compact, rugged nano enclosure True bypass Adjustable tone 9 volt battery included Optional 9. 6DC 200 power supply available SUSTAIN CONTROLadjusts