A tube overdrive sound in a box for people who need subtle smooth drive and warmer than TS-808 legendary. Circuit inside come with JRC4558D the most IC chip use with great pedal on the world This pedal is Mosfet Edition Series same as British Classic Overdrive it's have a Mosfet switch for select between silicon diode (up) or mosfet clipping (down) for dynamic headroom responds.True bypass wiring with input ground signal and support 6-18v DC for better sound tone dynamic