Check out the pics on my website
http://www.pbase.com/riadanza/studio Check out the Wiring pics on the bottom.
What I did is XLR into the mic pres on the C|24 to mini quick connections on the back of my patchbay, you would then do the same thing with the D-Sub connectors on the back of the C|24... then if I want my Avalon to be routed to the 1st mic in on the control 24 I just patch it in.
Rob