Electro-Harmonix Germanium ODClassic '60s Germanium transistor overdrive and more. In addition to a Gain control, the Electro Harmonix Germanium OD allows the user to control Bias for attack and the circuit Volts for that sweet spot found when a battery's voltage dips. Dial up that slightly torn speaker sound OR dial in total Germanium "Satisfaction." Specifications True bypass Gain control Bias knob for putting your sound right at the edge of break up Volts knob for reducing