My son tried this out at the music shop and it sounded so damn funky that I bought it there and then for AU$300.
It has a guitar and a bass input and 4 knobs, there is also an input for an expression peddle that can let you use it as a manual wah.
The king of the knobs is the MODE knob , it lets you choose from Up, Down, Sharp, Humanizer, or Tempo Set.
Up is very cool if set up properly it works as an envelope filter, Down is crap (may as well not be there) and Sharp is the same as Up but with a more pronounced "quack" in the higher registers.
Humanizer mode is freakish, you could tweak it for hours on end using the Vowel Knobs and get all sorts of sounds including Bootsy Collins, Speech (of various types), Psychadelic Science Fiction Meltdown, etc. etc. The Humanizer is very cool but it has fuzz on nearly every setting, and it would have been nice to have the no-fuzz option.
You can also set the tempo of an auto wah very easily on this pedal, it just takes 3 stomps.
This peddle's versatility is fantastic, many sounds you could get are in pretty bad taste but I have already found about a dozen "gems", including the lovely 'envelope filterish' sound which is almost exactly like the wah on all the instruments in this video of "Scratch and Sniff".