I just picked up a Mojo Hand Analogue 442 Red (formerly the Boomstick Audio Bottom Feeder, Analogue 442 Red before
that lol). I've also got the Barge Grinder and while it's
very cool, the 442 Red is nice for it's simplicity. Two knobs. It's based on the DOD 440 (and modded for bass guitar). It doesn't get as wild as some other filters, but it's got GREAT low end beef... so much so that at some settings it sends my Shuttle 6.0 into immediate clip. lol I could definitely see having both on the same board and using the Grinder for the wilder side of filter effects.
Some quickie reviews of other filters I own:
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MXR Bass Auto Q - Mild to wild, the "shimmer" function makes for some very watery, funky sounds. Good amount of control over sound.
Ashdown Bass Envelope+ - Not
quite enough range, but still funky. More on the tame/subtle side, but not in a bad way. Decent touch sensitivity. VU meter is a surprisingly handy touch.
EHX Micro Q-tron - Nice range of the right sounds, but I noticed a slight volume jump which was a little annoying. Anything but Low Pass is pretty much useless on bass IMO, unless you're looking for "an effect."
Digitech Bass Synth Wah - Lots of functions. The synths sound good but aren't anything I'd ever actually use. Setting #2 (envelope with built in octave) is pretty tasty, blend control is nice to have.
Ibanez AW7 - Bassballs-esque in that it has distortion built in (selectable to before or after filter). Decent envelope sounds, but it seems to drop just a little low end. Also, doesn't seem to play well with my active basses.
I'd be happy to weigh in with more detail on any of these if anyone's interested. I've got clips of some, can record some of any others.
My full review of the Grinder is over at Harmony-Central.com and I did the
Link Removed.
5sg.
P.S. I very much want to get my hands on the Pigtronix EP-1... check out Doug Johns' track Chew On A Dog!