Should be possible to use this with the E Pro.
The only thing is that, the E Pro would probably work on the "Oct per Volt" standard that all Moog synths work with, while Korg equipment work on another standard - "Hertz per Volt". If you plug in the CV (Control Voltage) Out of the E-Pro to the CV In of the MS-10, you wn't be able to track BOTH gear to be in tune (as the standards are different here).
A way to work around this is to plug E-Pro's CV Out to something that says "FM In" (in the Patch Panel under the "Osc Box") in the Oscillator section of the MS-10. Then "tune" the MS-10 (using the FM knob on the lower left of the panel), to be unison to the E-Pro's pitch. Test to see if they track one another up and down several octaves by playing your E-Pro.
The Volume CV of the E-Pro should be plugged into the VCA In to control volume. Remember, to set the MS-10 to its "Normal Setting" (as mentioned in the manual) before modifying.
See if this can start you off to getting something.
As I said, I've not tried this before as the Etherwave doesn't do CVs!! But I do own a MS-20 (bigger brother of the MS-10 with 2 oscillators instead of 1) and a MS-50, which is sort of like a keyboard-less MS-10.
Let me know how it goes.
Cheers!
Theremino