Guitar Pedal X - GPX Blog - Electro-Harmonix Finally Releases Expanded and Presets-enabled Pitch Fork+ Dual-Voiced Polyphonic Pitch-Shifter and Harmonizer
Electro-Harmonix Pitch Fork®+ Polyphonic Pitch Shifter / Harmony Pedal (Demo by Bill Ruppert) - YouTube
EHX Pitch Fork Polyphonic Pitch Shifter - Five Star Guitars