It's like an organ sound! Thick octave harmonies! The Poly Blue Octave is the ultimate octaver pedal with fuzz and modulation. It features four independent level controls: 1 & 2 octaves down and 1 & 2 octaves up, and in polyphonic mode it produces high-quality sounds for both chords and single notes, while in monophonic mode it produces analog-style pitch-shifted sounds. You can add dry signals to blend to your liking without losing the core. By adding fuzz and modulation with different effects in each mode, you can create a heavy sound that you wouldn't expect from a guitar/bass. You can also use an EXP pedal such as the Dunlop/Volume(X)8 to switch between two different settings, or connect an external switch such as the M199 Tap Tempo Switch to turn the FUZZ and MONO switches on and off. DC9V power supply (batteries cannot be used)