Effect pedal for electric bass guitar that enhances the sound of any connected instrument by emphasizing the instrument's tone spectrum. Inspired by a rare 1970s pedal, it provides the kind of results that can be obtained from combining a cocked wah with a comb filter. It features dedicated Spectrum and Balance controls for awesome sound shaping, status LED for effect on/off and battery check and rugged electronic on/off switch for highest signal integrity in bypass mode. The pedal runs on 9V battery or the Behringer PSU-SB DC power supply (not included).