Amazon.com: MeloAudio Tone Shifter Mega MIDI Foot Controller and USB Guitar Recording Audio Interface for iPhone, iPad,Android Devices, Mac and PC : Musical Instruments
Meloaudio Midi Commander Guitar Portable Usb Midi Foot Controller With 10 Foot Switches 2 Expression Pedal Jacks 8 Host Presets - Guitar Parts & Accessories - AliExpress
DIY Arduino Midi Controller for Line6 M5 - YouTube