Working Prototype theremin DEMENTIA LABS Synthesizer optical theremin "VOLT -TRONIC" PROTOTYPE OF THE OPTICAL THEREMIN THAT WAS BUILT  FOR SEAN LENNON pics of Sean playing optical theremin included .a variationof this unit is usedonstage by Kenny5 and THE DETROIT VAMPIRES..pics included. has a main osc1 and an LFO  runs on a 9v battery plugs into a guitar amp with standard 1/4 cables not included.  Plays sounds based on how much light hits tube.  Makes vintage sci fi movie sounds as you wobble your hand in the light..OR COVER THE LIGHT SENSOR...