This is one of the projects in the amazing book ‘Arduino For Musicians’ by Brent Edstrom. I had a bit of trouble with it occasionally breaking/crashing into white noise, but with the help of some nice people over on the Mozzie Arduino synth forums we managed to get it to work. I think the books errata has since been updated, so check that out before you upload the sketch.
Breadboard stage
Designing the case
Case Layout design for Laser cutter
Engraving the text onto the project box
Paint added to the engraved text, cutting out pots etc