Although note events are not generated by the theremin user interface of the instrument, there is no reason that they could not come from other sources, either a sequencer providing a time related pattern of note events or a hand or foot operated trigger.
I have used abrupt interruptions to the audio of my etherwave in a variety of forms, including a handheld pushbutton killswitch and a GigFX Chopper effects pedal in several recordings and it significantly extends the utility of the instrument. I would very much like to see this in the theremini.
![Smile :-)](./images/smilies/icon_smile.gif)
Couple of examples, first with a crude killswitch, and second with the Chopper and both with several other effects.
http://youtu.be/oEEE2hwJRDQ
https://soundcloud.com/beat-frequency/snippetymen