Code and circuit for a six-function Arduino-based USB footswitch :: Sacha Chua
Arduino MIDI controller pedal for guitar FX – jimkim.de
USB Pedal HID Keyboard With Arduino Leonardo : 9 Steps - Instructables
USB Midi Foot Controller Help - Audio - Arduino Forum
Pedalino: A smart, open source wireless MIDI foot controller for guitarists and more « Adafruit Industries – Makers, hackers, artists, designers and engineers!
ElectroSmash - pedalSHIELD UNO Arduino Guitar Pedal.
How to Build DIY Arduino USB Expression Pedal for Efektor WF3607 | Kuassa
Arduino Footswitch (control Your Guitar Amp With Arduino) : 10 Steps (with Pictures) - Instructables
Build your own MIDI controller. (I did!) - Effects - Basschat
MIDI controller for HX Stomp - Wire DPDT stomp switches as momentary? - General Electronics - Arduino Forum
DIY MIDI foot controller - Construcción y Reparación de Amplis y Efectos - Musiquiatra
An Arduino-powered automatic guitar footswitch | Arduino Blog
DIY Arduino Midi Controller for Line6 M5 - YouTube
Gumtown's DIY Arduino midi note foot pedal
Simple To Build Programmable Foot Switches | Hackaday