Marius4560 created a pretty rad project for their Human-Computer Interaction course assignment: a Teensy 4.0-based looping pedal that even provides its own unique ideas for beats!

The Audio Adaptor Board-based project generates random rhythms and drum sounds, plus lets the user record a chord progression to jam along to. An HTML template generator expands options even further. The video below gives a great overview of its usage, and the GitHub repo contains not just source code, but also more detail on the project.