This is a 16-step sequencer and synth that I built with the Beaglebone Black and Bela board. It runs a Pure Data patch that reads 16 digital inputs for the sequencer steps and 8 analog inputs that control the synth parameters: tempo, volume, frequency of oscillator 1, multiplier of osc 1 which controls oscillator 2, attack, decay, polynomial waveshaper 1, polynomial waveshaper 2. The case is laser-cut acrylic. It has internal speakers or external audio output. Thanks to the wonderful people at Bela.io!