id like to hear some sound clips of this. I'm sad to hear that the LP down mode is difficult to get working. that's exactly what i'd be using the most of. and lowrider plus nautilus=jerry garcia! jerry actually had a killer setup almost exclusively for using a mutron III. it consisted of an on guitar buffered (pre volume knob) effects loop that sent his effects pedals the same volume level no matter where his volume knob was set!
ive also noticed using a compressor before envelope filters helps control the attack a bit and if you mess with your volume knob a lot you might wanna try using a volume pedal after the envelope filter, or get a jerryified effects loop on your axe!