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Amazon.com: T-Rex Engineering QUINT-MACHINE Pitch Guitar Effects Pedal with Fully Adjustable Octave Up, Octave Down, and Fifth Up Controls; Simulating Organ, Synth or 12-String Sound (10094) : Musical Instruments
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Guitar Pedal X - GPX Blog - Mojo Hand FX's Octaverse is a really cool and elegant Reverse Octave Up / Down Delay
Best octave pedal for electric cello: Electro Harmonix Micro POG vs. tc electronic Sub 'n' Up | The Wong Janice - Ambient Cello Meditation Music
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