Ok did what you said, will report back with results. EDIT: Ok that worked like a champ... now I have to change my instructional on how to take calls. NO repeaters are necessary. I'll go ahead and post it on that other discussion. For those following this it allows:
1. No repeaters are needed (VAC or similar still is).
2. You can separate caller's voice from your voice so your settings don't affect his/hers (in my case, my co-host skyped in and I had line 2 and mic going to line 1, so with skype set to line 2 and me setting mic input to line one, my mic eq/comp settings also applied to him, and he had a great mic with awesome bass already so it completely slammed him into a wall, just about to blow out my speakers, sounded terrible).
3. If you are having sync issues with cartwall items, just set cartwall playback to whichever line you have set to aux input (I'm using VAC line 2, so my setup is aux input 1: line 2, and Cartwall playback: line 2). For whatever reason, that will sync your sound effects to your voice so they aren't out of sync.
4. It got rid of most of my popping/crackling (I still have main buffer set to something like 333ms; setting it to 75 gave me issues).
All is good.