Electro-Optical circuitry and audio taper allow smooth, studio quiet volume control. Minimum Volume knob is used for a smooth transition between rhythm and lead volumes. Minimum Volume control is now foot-switchable. Powers from one 9V battery or optional Morley adapter. LED Indication, cold-rolled steel housing, quick clip battery door and two-year warranty. Features include: • Electro-Optical Volume pedal is consistent and quiet (no pots to wear out) • Audio taper allows smooth volume control or violin type swells • Switchable Minimum Volume Control – use as either a Rhythm/Lead pedals or Volume pedal with the click of a switch • Minimum Volume knob is used for a smooth transition between rhythm and lead volumes • Powers from one 9-volt battery or optional Morley 9V adapter • Cold-rolled steel housing, LED indication, quick clip battery door and two-year warranty • Works with guitar, bass or keys