SolidGoldFX Beta Bass Overdrive Level Control: Allows you to increase or reduce your volume level. Drive Control: Allows you to increase or decrease the amount of Drive. The tone will get slightly brighter, as you increase the level of distortion. Tone: Allows you to adjust the amount of bass or treble content. True Bypass Switch: Allows you to engage or bypass the effect. 9V DC Input: This pedal uses a negative ground, 9-18V DC power supply. Battery operation is also possible