Ah yes, thanks you're right, I've got a Focusrite Scarlet 6i6 which is AC.
So now i'm looking at a whole world of other possibilities... I have an SPDIF output. I could get a cheap USB to ADAT and use an ES-3. OR. Get a MIDI to CV. I may just ask a general question about this as i'm not quite getting the answers from the copious threads i've read...

I basically would like to use the DAW to play out simple compositions which I can fiddle around with on the rack. I guess my priority is that eventually id like to have a few voices controllable through midi...