M8 Tracker
https://dirtywave.com/products/m8-tracker
https://www.youtube.com/watch?v=XwzY2BR3Qfk
https://docs.google.com/document/d/1H-cG_KhDzwKa0zZlofcjiJWhg93NeFhNdf5H2ZZX34g/edit#heading=h.a2gptas9rdza
https://d28vpsbeh0wh2.cloudfront.net/
https://www.impbox.net/matey/DIA_CHORDS