The Dirty Robot pedal offers two different synth voices (synth and vocal). It works for guitar or bass with no need for a special pickup. The 360 degree drift knob lets you blend square wave with octave and sub synthesis soundscapes. Other features include built-in chorus and vibrato, stereo inputs and outputs, bi-color status LED indicator, and true bypass circuitry. It’s powered by a 9V DC 1.3A power supply (not included). This pedal is in excellent condition.