Amazon.com: DaierTek Guitar Effect Pedal Knob Metal Black Potentiometer Knob Anodized Aluminum Amp Pot Knob with Set Screw 1/4 -13Pack… : Musical Instruments
Write-Up: Adding MIDI Control to a Guitar Effects Pedal - Audio - Arduino Forum
B" Taper 16mm PC-Mount Potentiometer – Build Your Own Clone
Coda Effects - Ultimate guide to guitar effect wiring: how to wire DIY guitar pedals properly?
Digital potentiometer for volume control : r/diypedals