You can play music with the Trellis M4 by turning it into a great input device for synthesizers! It can send standard MIDI (Musical Instrument Digital Interface) note data over USB MIDI to a software synth on your computer, laptop, (including web browser based synths!), or mobile device.
Using the built-in accelerometer (thanks to Analog Devices for the ADXL343!), we can also send control change (CC) data, such as mod wheel, and filter cutoff values, and even pitch bend settings just by tilting the Trellis M4!