Thorpyfx Veteran Silicon Boost/Fuzz - UsedThere are two independent foot switches to control each side. The fuzz is first and it runs into the Treble mids Bass booster. There are six knobs split between two effects. The Fuzz side has controls for Fuzz, Volume, Smooth and Bias. Smooth controls the input impedance to the circuit and gives you a less bass heavy, smoother fuzz. Bias controls the overall "heat"available to the circuit, increasing output volume on tap and the amount of mids in the