8-step MIDI sequencer for Adafruit Grand Central M4
Assumes hardware connections:
- step LEDs:
D22, D30, D36, D42, D48, D23, D31, D37
- step buttons:
D26, D34, D40, D46, D52, D27, D29, D35
- step pots:
A0, A1, A2, .A3, A4, A5, A6, A7
- tempo pot:
A8
- Intermittent variance in step duration
- some missing noteOffs after note value changes