Here's another new video showing off the timbre and playability of the Open.Theremin UNO v3. YouTube user Severed.Garden performs Tomaso Albinoni's Adagio along with a string backing track.
Open.Theremin is an open source theremin project based on the Arduino chipset. Version 3 of the Open.Theremin has just been released and features a completely redesigned PCB, auto-tuning, and a new mute function.
Learn more about the Open.Theremin project at http://www.gaudi.ch/OpenTheremin