Guitar Pedal X - GPX Blog - Electro-Harmonix's Intelligent Harmony Machine delivers a Neater and Smarter Harmonizer with Classic Pitchfork style Pitch-Shifting onboard too
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Electro Harmonix Pitch Fork+ Polyphonic Pitch Shifter / Harmony Pedal - Town Center Music
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Mooer Pitch Step Shifting and Harmony Pedal | CheaperPedals.com