Here's a new video from Coralie Ehinger demonstrating building and playing an Open.Theremin v2. For added fun, she live-scores some classic video games to give you an idea of how it sounds.
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.
Coralie Ehinger is a Swiss theremin player and organizer of the first Swiss theremin festival N / O / D / E. She runs etheremin, a French theremin platform and gives lectures on the history and the art of playing the theremin at schools.
Learn more about the Open.Theremin project at http://www.gaudi.ch/OpenTheremin