He is routing the EVox output that is being played by the continuum back into the Continuum's AES input and processing it further with Delay in the EaganMatrix engine. I do believe this can be a very interesting way of using the Theremini. Right hand can be playing while the sound is routed through the AES input of the Continuum and then the fingerboard can be set up to send MIDI volume and other theremini control parameters while playing. I bet you I can get a wider and more natural volume profile this way.
I finally tried connecting the Continuum to Omnisphere tonight. Having some issues getting the Continuum's MIDI connection for the Editor working simultaneously with the MIDI connection required to drive Cubase running Omnisphere plugins. Ed Eagan has a very nice video that shows how to do it with Logic Pro - but I need to use Cubase. I'll post how to do that when I figure it out.
But I found that I can use the editor to set a continuum patch to play Omisphere, then disconnect the editor and run the Continuum through the MIDI interface I use to connect to Cubase and it works fine. What fun! The most important thing is to match the pitch bend of the continuum to Omnisphere (have to limit it to 24 for Omnisphere). Then set Y and Z to CCs or controller values that you want to map things to in Omnisphere as the video illustrates.
Finally you need to load up the Omnisphere patches you want (up to 8 channels worth - so set the Continuum up to Polyphony = 8). But I find it's a bit confusing to map so many channels to fingers - though you can get some interesting things going on when every finger plays a different sound - and changing ordering as your finger's polyphony change - though there are different settings for finger/polyphony priority. Better to just clone all 8 channels to channel 1 in Omnisphere to start so you can easily play polyphonically on the same sound to get used to playing and testing Omnisphere sounds. Then you can split the keyboard and play Omnisphere with Continuum sounds, etc. Very flexible controller.
This opens up a whole new sonic world for the Continuum that I can see is going to let me create some very interesting backgrounds and let me do a lot of experimenting as well! Of course you can connect the continuum to any MIDI source you want as well.
Here's just a bit of noodling using a continuum playing Omnisphere lines along with the Etherwave running through a PSP N2O Vocal format patch (theremin is the vocal sound you hear).
I can see I'm going to lose a lot of sleep playing around with all this.
https://soundcloud.com/rk53-1/continuumomnisphere-theremin-test