hey moonlapse, my setup is similar to yours! :p
Boss GT-6 > SPDIF Out to Audigy2 ZS > Guitar Rig 1.2 > freefilter, C4, reverb etc.
Cubase SX2 and Battery 2 with bits of nskit free.
I tried out free filter after seeing the thread on Andy's forum, and I applied it to that recent clip I...