Arpeggiator Synth for Neotrellis M4
Turn your Neotrellis M4 into easy-to-play, note-sequencing, ear & eye candy with the Arpeggiator Synth guide. The Arpeggiator uses musical modes mapped to the Trellis keyboard, so pretty much anything you play sounds good. Grab the firmware, instructions, & source code over at the Adafruit Learning System.