The World's first volume and overdrive expression pedal. The Ernie Ball Most Valuable Pedal provides a super smooth foot sweep, ideal for precise volume control with no high frequency loss at any volume. Works with both active and passive electronics, the MVP also includes a powerful gain boost allowing players to increase the audio signal up to 20 decibels. The MVP features a compact, rugged design consisting of a billet aluminum housing that is virtually indestructible. Requires DC 9V/100mA minimum power supply or 9V Battery. Part number 6182.