This wonderful circuit demonstrates the amazing capabilities of the littlebits modules. This circuit uses the Arduino bit as string synthesizer, together with add-on modules like filter and envelope. A new module in this circuit is a self constructed MIDI bit. This bit let you connect any MIDI keyboard with DIN plug. As such, every thinkable parameter can be linked to the littlebit arduino. The sketch uses 2 outputs, a LoFi on d5 and a clean and smooth on d13. In this video, I've used the d13 The arduino sketch is based on a open source project by Jan Ostman - https://janostman.wordpress.com/ The sketch is completely rewritten to adapt the Leonardo Littlebits module. And believe me, it was a complex sketch. Had to change timers, MIDI and ADC ...