Yes, it's a theremin. Yes, I can play it.

The Theredwin was built by hand many years ago upon another theremin's empty circuit board... Since then, it has been
tweaked into producing a "cresting wave" sine signal which has the perfect hint of harmonics.
It also has a saw, square, CV outputs, built in gate, overdrive and frequency limiting.
It is contained in a hand painted plexiglass and steel case with copper antenae.

Hear the Theredwin in a live improvisation with Phillip Stearns on guitar (I also manipulate
radio and heterodyning) -- Denver Heterodyne