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The Technology of Wah Pedals
Hall sensors as a replacement for heavy duty wah-expression pedal pots
Guitar Swell Pedal Circuit
How to Make Guitar Wah Wah Pedal Circuit
Ken Shirriff's blog: February 2022
DC-operated Volume control
Two StompLFO projects: Mini Tremolo – Electric Druid
Morley 20/20 Volume Plus Volume Pedal | Sweetwater
Soviet volume pedal and japan sewing machine pedal.
Optical Theremin | Synthrotek
Implement FM Tone Lossless circuit board to a passive volume pedal - YouTube
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Electronic States — Here's a weird one. This is a vintage Morley VBO,...
Deep Vibes Optical Vibe Machine
Wiring Diagram for Volume Pedal? : The Steel Guitar Forum
Morley Wah Volume - Swell Mod and Cleaning | Telecaster Guitar Forum