Midi controller - 5 Pots - Pro Micro - HELP (newbie) - Project Guidance - Arduino Forum
USB MIDI Adapter - Hackster.io
Arduino (Pro) micro as a USB-MIDI device (MIDIUSB library) - and change its name to whatever you wan - The Nerd Musician
DIY USB Midi Controller With Arduino: a Beginner's Guide : 10 Steps (with Pictures) - Instructables
Expanding Arduino pro micro pins for MIDI Controller build - LEDs and Multiplexing - Arduino Forum
USB MIDI Adapter - Hackster.io
GitHub - P3Hi/3D-Printed-16-key-USB-MIDI-using-Arduino-Pro-Micro: 3D Printed 16 key USB MIDI using Arduino Pro Micro
Amazon.com: Pro Micro ATmega32U4 5V 16MHz Micro-USB Development Module Board with 2 Row pin Header Compatible ard-uino Leonardo Replace ATmega328 Pro Mini : Electronics