I got mine on Friday and learning how to use it.. I have an Avid Eleven Rack as well and have owned a Line 6 XT Pro.. I plan to profile my Marshall JCM2000 DSL100 and Vintage Modern Combo 2266CB..
I'm running the SPDIF signal into a M-Audio 192. So far I do not like the way it sounds after running through the sound card. It sounds great when listening direct from the Kemper.
I have 3 Gibson Les Pauls. 1 Music Man JP BFR, Jackson RR24M, Strat, Warmoth, SG and a few other guitars..