I have not tried it, even tho I had an XS at one time I didn't try to use the faders/knobs as a control surface, tho I thought about trying to set it up several times I never got around to it.
what have you done so far? I don't think there's a specific ES control surface definition, I would think you'd need to use ACT to get it to work and just map the I/O that way. have you tried that?