Emu XL-7 & MP-7 User's Group

Wow, this seems so complicated and almost as if I'll run into 
problems if I use my PC as the sequencer. :(

So, XL-7 seems to be the dream of sequencers right?

So, would this be the best set-up:

Virus Kc->XL-7->Rom Cards?

Or:

Midiman Keystation 61 MIDI Controller->Virus C->XL-7->Rom Cards

If I do it this way, will I be able to control everything from the 
Controller such as the Arpiggiator that is on the XL-7? When I had 
the Roland XP-80 set up, I also had an Orbit V1, and the arpiggiator 
on the Roalnd worked for the Orbit, and would record all my editing 
in realtime and the arpiggiator stuff too. So, In playback, it would 
play it exactly the way I was tweaking it in realtime. Will this be 
possible if I use the XL-7 as the controller? I heard the XL-7 
doesn't have the ability to tweak resonance once it's recording--it 
just stays set. What if I change the resonance while I'm using my KC 
while I'm recording on the XL-7, will this be recorded? Also, if I 
made a song, and saved it on my XL-7, and turned off all the 
equipment. Will the XL-7 tell the KC and Orbit3 what timbers I used 
on a song I load up? Or do I have to write all the timbers, and 
channels they were on on a piece of paper so that I can put them all 
back manually?

Thanks