Given that EHX are knocking it out of the park recently, this could be an interesting one!
[media]http://youtu.be/zjFTj1-eA0Y[/media]
If I read the blurb correctly, it can do +/- 3 octaves!
GAK has it listed at £161, which seems competitive. No idea how well it works on bass, but I'm sure one of the usual suspects will let us know before long