Martin Hertig took a guitar bag, hooked up an Arduino to the zips via conductive thread to make a MIDI controller and then added a Raspberry Pi into the mix to create his project, called Zippy. The Pi runs FluidSynth synthesizer software (as my Music Box does!) to play the sounds. One zip is for playing notes or chords, one controls vibrato and one changes the bar. You can see it in action below and see more photographs on Martin’s blog.