New issue of Make might be of some interest:
“Then, we dive into exciting DIY music projects, starting with the burgeoning synth DIY (SDIY) scene — with Detroit’s North Coast Modular Collective as our guide. Get the ins and outs of modular synthesizers and how to kit out your first setup, then build your own simple module and learn what makes it squeal with the Mt. Brighton Avalanche Oscillator. Or, go low-tech with a great-sounding Soda Bottle Marimba you can build for pennies, or 3D print your own speakers and instruments.”