I have spent time with a good number of envelope pedals and have found that they are good at different things. If you're looking for a really drippy wet kind of sound, kind of like Les Claypool in the last couple of years, the Digitech BSW would be a good choice. The Chunk unit has a great sound and is very dynamic but is somewhat harder to dial in. It would be a great unit for the studio, but live I think it's a bit too sensitive. I spent some time with the Emma Discombobulator but didn't much care for it. It's like the attack was too aggressive or something, I couldn't get a sound I was happy with. I much prefered the Maxon AF9. It has a nice Mutronish vibe and responded more smoothly. As for the Flip Funky Box, I thought it was more of a guitar pedal too, until I started experimenting with it. For that pedal you need to drive the front end with a clean boost of fuzz or anything that can get a hotter signal into it to get the tube going. I use my Studio Electronics Wolftone Chaos pedal (kind of like a growly fuzz)for the job. Then you need to tame the strong peeks coming out the back end. I find that the MXR M-80 brings the dynamics back without messing up the sound. The end result is one of the nastiest envelope sounds I've EVER heard. Super growly. Sounds angry. Probably not what most of you guys would be looking for in an envelope filter sound but I would recommend picking one up if you can find one and spend some time with it. It's made me wonder about how some of the envelope filters I've tried that didn't respond very well would sound with more gain in the front end. I'm curious to try a Lovetone Meatball or Electro Harmonix Bi-Filter, as they include attack and decay controls that would be very useful in dialing in sounds. Plus the Bi-Filter has two filters off the same envelope with separate controls for each one, so you can run them in opposite dirrections or parallel at different frequencies. Have any of you guys spent any time with the Bi-Filter on a bass? I am quite curious to see if it works well with bass as its' controls are quite comprehensive. It's just too expensive to purchase without having played through it.