In my very limited experience, don't use it on bass. I only tried it out in a store, and it thinned out the sound. It's designed for guitar, not bass. And doesn't do guitar all that well IMHO.
__________________ Practice doesn't make perfect - it makes permanent.
This is a pedal I'm still just a bit intrigued with- I can't see it doing a convincing sim in *standard* bass territory, but applying it to chords, above the 12th frets on a 6, hmm...
I've heard them make a Strat sound like a Martin(to my deaf ears, anyway). Sadly, the only way to really know would be to go down to GC w/my 6 and try it. Can you see the clerks & 12-yr-old wankshredders faces?
I have one and I use it (rarely) for the "body" effect. Add a sponge or paper towel under the strings to mute, adjust your playing technique and you can get something kinda, sorta, a little like an upright tone.
I would not use one for faux-DB tone- I can get close enough(again, for my bad ears)via technique & EQ tweak. I'd want it to throw fake-guitar parts onto song sketches, using a looper & other effects to compose and record ideas. I also have a cheap nylon-string guitar w/a piezo, so I can do the real thing, but I like the idea of sitting down w/my 6 & a bunch of pedals, & mixing up a stew of very different parts.