The 1511A Volume Pedal can be used to control volume of either a stereo instrument, (synthesizer, DJ equipment) or 2 instruments at the same time, thanks to the dual inputs and outputs. You can set the minimum volume for when the pedal is fully up, by adjusting the knob under the pedal. The pedal can accommodate two channels of sound as it features two 1/4" inputs and outputs. This pedal does not require any batteries. If you have ever needed easy control over your volume then this pedal can help you. You can have complete control over your volume even when both hands are busy. Take your solos to the limit and kick up those chorus"s with a volume pedal that can offer you the dynamics of a pro. Features: Deliver A Professional Performance A Versatile Volume Pedal Stereo or 2 Instruments Control 2x 1/4" Inputs (IN1, IN2) 2x 1/4" Outputs (OUT1, OUT2) Passive Electronics (No Batteries Required) Independent Minimum Volume Adjustment Knob Package included: 1 x Volume Pedal