I'm looking for an envelope filter that'll play nicely with my P-Bass. I had a 3Leaf Proton for a while and, while I loved the sound, I could never get the "quack" I wanted out of the pedal (see Spencer's demo video for excellent quackiness, BTW). My P-Bass has flats wounds and passive Fralin pups, which aren't super hot, but they're not wimpy, either. I just need something for basic Bootsy/`70's funk/pop sounds. I won't be doing any crazy synth or dub stuff. I'd also like to stay in a "standard" single-sized box (which rules out the GR2, Q-Balls, and a few others). Any recommendations? Are there any envelope filters known for having higher input sensitivity?