Megachordotron is a DIY MIDI controller using Teensy
For 2016 Maker’s Faire at New York, Will Ware made Megachordotron, a Teensy powered MIDI controller with a touch sensitive keysboard. In his own words: “It’s intended for people (like myself) who are too clumsy to play a guitar“. This design is open-source and he has posted all the files on Github.
In the following Youtube video, he shows the demo of his instrument.