The open-source nature of the project also means that you can modify and expand upon the design to suit your requirements. “TheMIDInator is a MIDI controller based on an Arduino MEGA 2560.

Strictly speaking, a Theremin uses a pair of antennae that act as capacitors in a specific R/C circuit. Looking at ...

Arduino has been used to control a stepper motor driver a MIDI interface, scanner parts and basic keyboard to great effect, check out the video below to learn more. Watch this video on YouTube.

Is it a keyboard? Is it a guitar? It's the ARKeytar, an Arduino-based MIDI controller shaped as a maple wood keytar.

Thorin Klosowski DIY musical instruments are their own thing entirely, but if you're looking for a place to start, Adafruit has a guide to building your own MIDI controller using an Arduino.