Arduino MIDI Stepper Synth

I designed a program that turns an Arduino into a MIDI device and allows you to "play" some NEMA 17 stepper motors.
I had seen other people do this project before, but there was little to no code available regarding this, and if there was, it would be either confusing, complicated, or limited (usually all three!).
I decided to design my own code from scratch and document it so that any person can use it, as well as understand how the code works.
Ironically, this code is extremely simple, with a single function actually running the steppers. Oddly enough it solves the issue of running multiple stepper motors on an Arduino Simultaneously.
The only real purpose of these 3D models is to hold the stepper motors and make everything look professional.

Project Page: https://www.hackster.io/JonJonKayne/arduino-midi-stepper-synth-d291ae?ref=featured
GitHub: https://github.com/jzkmath/Arduino-MIDI-Stepper-Motor-Instrument
Songs:
https://youtu.be/eJZtdH-spc4
https://youtu.be/inYrUpq-1