The original 1969Muff Fuzz had just a touch of overdrive and sounded like a vintage amp with a slightly torn speaker. Electro-Harmonix paired two of these together in one box to create the Nano Double Muff. Use just one Muff for a hint of milky distortion, or cascade the second Muff for over-the-top overdrive that turns the milk into cream. In single mode, the amount of overdrive will lessen as you decrease the volume on your guitar. You can compensate for this by increasing the volume of the single Muff. In Double Mode, the Muff knobs will interact with each other so you can tweak your sound for the perfect amount of distortion every time. The Electro-Harmonix Nano Double Muff is true bypass, and operates on a 9V battery (included) or optional EHX 9.6V AC/DC adapter. Two Muffs in a Nano-sized pedal Operates in Single or Double Muff modes Simple control setone knob for controlling the level of each Muff True bypass