Take some hints from Hexpad

[deckerego]

@jedgarpark just posted a great build to the Adafruit Learning System with Hexpad: MIT licensed code available at https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/main/Hexpad/code.py

Aside from the very cool hex layout there are some interesting ideas around choosing modes and the layout of chord intervals - will be interesting to see if there's anything to learn.