A CircuitPython-based MIDI chord machine built for the Adafruit MacroPad RP2040. Inspired by devices like the Pocket Audio HiChord, this custom firmware transforms the MacroPad into a powerful chord and arpeggiator performance tool with rich LED feedback and a dynamic OLED interface.

Ensure your lib/ directory on the CIRCUITPY drive contains the following CircuitPython libraries:

• adafruit_display_text
• adafruit_macropad
• adafruit_midi
• adafruit_pixelbuf

You can download these from the Adafruit CircuitPython Bundle.

1. Copy code.py to the root of your CIRCUITPY drive.
2. Install the required libraries in a lib folder on CIRCUITPY.
3. Reboot the MacroPad or press Ctrl+D in the serial console.

Upon boot, you'll see:

• A boot animation with animated pixels and a "WOLFPUNK CHORDS" title.

• Trigger chord notes. Each key corresponds to a scale degree in the key.

• Key 8: Cycle through chord inversions (0, 1, 2)
• Key 9: Shift octave (-1, 0, +1)
• Key 10: Change arpeggiator mode (Off → Up → Down → Random)
• Key 11: Toggle Latch mode (Hold chords after release)
• Key 12: Toggle chord type (Major / Minor / Diminished)

• Turn: Adjust key offset
• Press + Turn: Adjust BPM

• Keys 1–7: Yellow when idle, green when pressed or arpeggiated.
• Key 8: Red (brightness indicates inversion)
• Key 9: Blue (brightness indicates octave)
• Key 10: Orange (tempo pulse when arp active, dim when off)
• Key 11: Purple (bright = latch on, dim = off)
• Key 12: Green (brightness varies by chord type)

Chord: 60 64 67
Key: +1 | Oct: 0
Inv: 1 | Lt: 1 | Maj
Arp: Up | BPM: 120

• Chord: MIDI notes of the current chord
• Key: Offset in semitones
• Oct: Octave shift
• Inv: Chord inversion
• Lt: Latch (0 = Off, 1 = On)
• Maj: Chord type
• Arp: Arpeggiator mode
• BPM: Tempo

GNU General Public License v3.0 (GPL-3.0). Created for creative MIDI exploration with the Adafruit MacroPad RP2040.

Developed by WOLFPUNK for expressive chord and performance interaction, ideal for live electronic music and generative composition.