Hi Christopher,
the sound of your Phoenix design theremin is indeed very very lovely. I hope to have a chance sometime to play one of those myself.
The tone colour/timbes range of the Etherwave is quite ok, although I do send it through pre-amp/attenuator, multi-Fx modeling pedal, also emulating tube amps (and containing an actual pre-amp tube that emulates a tube amp's power stage), and usually one or two low-wattage tube amps one of them with a very old (1940s/1950s) loudspeaker cabinet (probably was a radio extention speaker). Those all subtlely interact and colour/equalize/mould the tone and help to shape the final voice that will be heard in the air.
Sometimes I put one or two of those plastic, usually in neon colours, toy 'microphones' that contain a spring to have e reverb effect close to or on top of the speaker for an extra mechanical/acoustical reverb. I used to use such a toy acoustical reverb microphone already sometimes when playing instruments like bamboo flute or Dan Moi mouthharps and doing overtone singing.
I'm still kind of testing with how to best set up things for live performances/concerts, in terms of what boxes/pedals to use, what to send to the main mixer, to rely on the available (floor) monitors and PA system only or to bring my own amp/speaker to set up for hearing my own theremin sound accurately enough to help with good ear-hand coordination and of course improvisation themes/frameworks/moods/styles to play with. I've been making some preliminary appointments for a venue/place where I can do a few perfomances meant to try out things and help it find its form(s) until the end of 2019 and by then I hope to be able to take it up a notch, and also hope to have made the social networking connections to be able to get some gigs in 2020 and onwards.
Still have to try out a bit if the Loop Station has a place in it, or if that will mainly be kept for the home studio and my weekly webradio and SecondLife shows.
It'll probably have theremin and a percussion / handpan player as basis with room for occasional guest musicians joining in as well.
That's the plan/aim at least. I hope to some extent to be able to do for the theremin what I did 30-40 about years ago for the didgeridoo in the Netherlands and Europe, which was virtually an unknown musical instrument at the point in time I started playing it, after first after having heard it on the radio a few years earlier, but no other information than it being music from the Aboriginals from North Australia, and finally in the Australian Gift Shop in London, in the storage cellar, finding out how it looked and what was the sound producing principle of it (the one they had there was cracked, but I then knew I could start with a suitably sized hollow bamboo stem or some hollow tube, PVC or thick cardboard).
By then Lights in a Fat City emerged from London/UK and put out the first European album featuring the didgeridoo prominently, and some later Yothu Yindi scored their international hit with "Treaty" and did several world tours. I've been doing performances/gigs/jams/recordings/workshops/teaching with it over the years and contributed some to now most people are somewhat familiar with it, and new generations of European players have developed sever new and distinct and somewhat country specific playing styles by now, it prettywonderfull into which it has grown/flowered.
Robert