So how does the self-playing Theremin operate?  If it isn't roll
operated in the video, can it be roll operated ?

Bruce Grimes

 [ A pneumatic mechanism to wave the hand that plays the Theremin
 [ might be similar to the self-playing Swanee Whistle (a slide
 [ whistle, also called Lotus Flute) player featured in a large
 [ orchestrion built by Popper & Co. of Leipzig.  See page 592 in
 [ "Encyclopedia of Automatic Music" by Q. David Bowers.  -- Robbie