@holmebass: this is what I have in the loop and it all works nicely! if its out of the loop it has been tried and didn't sound bad just not to my taste.
3 Leaf-Audio Groove Regulator
Effects Loop Send:
Boss OC-2: Octave
"Planeta Fuzz" Wooly Mammoth Clone Gated Fuzz
Digitech Bass Synth Wah
Boss FZ-2 Hyper Fuzz
Behringer BSY-600 Bass Synth
"Blueberry Muff-In" Guttermouth-Modded Russian Big Muff
"The Love Box" Fender Sub-Lime Bass Fuzz
Way Huge Swollen Pickle MK II Fuzz
Tech 21 Red Ripper
Baddy One Shoe Infinity Drive
"Pump N Dump" Montreal Assembly Wrong Side of Uranus
"Wah-Wah Whale" Dunlop 105Q Bass Wah-Wah
Effects Loop Receive:
As you can see I have the WHSP-MKII in the effects lop of the GR-MKI. In my adventures I have come to a conclusion that the Swollen Pickle is so powerful it crushes the Groove Regulator if run into it. Fuzz/Dirt after an envelope filter was never my sound so the effects loop was/is a godsend! Like I said before the effects loop lets you clean affect the filter. Since you dynamics affected the envelope then your dynamics controls everything in there. Everything that is out of the loop (POG2, Vibrothang, El Capistan, Boss DD-7) is not too affected by clean dynamics so that besides other reasons are why they are not in the loop.
The Red Ripper is damn useful and like I said before give me a few days and I'll post some clips/video to give you a crappy sonic run through!