This device adds a preset amount of gain, using a single control. With a guitar, this lets you boost your signal for lead work, adjust between two different guitars with unmatched output (i.e., humbucker to single coils), or it can supply a permanent boost in a long effects chain where signal drop off is a problem. Power: Single 9-volt battery or Dunlop ECB-003 AC Adapter. Gain knob adjusts total output volume when micro amp Is engaged.

Controls: Foot switch toggles effect on/bypass (red LED indicates on) Speed knob varies rate of phase sweep.