The mod really transformed this pedal. I do have to mention that There is a squeal you get if you move the gain knob past 3 o'clock. I assume it must have something to do with how the mod interacts the range of the gain. From what I understand its normal. Otherwise this pedal kicks the butt of most other ODs I have tried. Lookin to trade for an expression pedal. Mod info A fellow Tb'ers review and clip of the Mod.