YouTuber maasijam made an amazing DIY Model D MIDI controller using Teensy! He plans to share all the code you'll need to create your own! Here Fugue Machine sequences Model D, while he twiddles knobs!
Jamming with my Teensy based Model D App Midi Controller.
Model D sequenced by Fugue Machine.
BOM, Gerbers and Teensy code will follow. I plan to create a website where you can download all the needed files for the controller.