Yep, Digitech does NOT like to have a dirty signal going into the pedal. I bought my first Digitech rack mounted processor in the early '90s, and it HAD to have a clean signal, or it would sound awful. I run my RP80 alone for that reason, and only use the clean channel for the amp. The RP80 is much happier that way...
Thanks for the hints... I'll probably be setting up mine using "Tip #2" soon! Now I just gotta find the footswitch for my amph...
Guitars:
Fender 2006 MIM Fender Stratocaster HSS in 3TS
Ibanez RG 570 with a bridge Invader
ESP M II Deluxe with a Tune-o-Matic bridge
Eleanor, the magical, mystical Road Worn wonder Tele
Blackstar HT Club 40