How to Build a MIDI Harmonizer - The Complete DIY Guide

A complete, step-by-step guide to building your own MIDI Harmonizer from scratch using an Adafruit MacroPad RP2040. Written by Ed Hogben - trumpet player, musician, and the creator of the MTG MIDI Harmonizer.

This guide covers everything: the hardware you need, how to load CircuitPython, how to code the device yourself (even if you have never coded before), how to connect it to a DAW or HX Stomp, and the music theory behind designing colourful voicings.

What you get:

• 19-page illustrated PDF ebook
• Full hardware and firmware setup walkthrough
• DAW setup guides for Ableton Live and Logic Pro X (more coming soon)
• HX Stomp integration guide
• Music theory section with interval reference table and voicing examples

Delivered as a digital download.