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Amazon.com: MXR M225 Sub Machine Octave Fuzz/Octave Guitar Effects Pedal with Independently Switchable Octave Up Effect and Parallel Serial Switch for Octave Down Fuzz Processing with 2 Path Cable : Musical Instruments
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Boss OC-2 Dual Octave Down Guitar Pedal Schematic Diagram | Guitar pedals, Diy guitar pedal, Electronic circuit projects
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