Battery Operated: Polyphonic

Electro-Harmonix Pitch Fork Polyphonic Pitch Shifter Quick View
Electro-Harmonix Pitch Fork Polyphonic Pitch Shifter $174.40
TC Electronic PolyTune Clip Polyphonic Clip-On Tuner Quick View
TC Electronic PolyTune Clip Polyphonic Clip-On Tuner $49.99