octave box for bass guitar

Hi chaps - I'm playing bass in a classic ld vox, guitar, bass and drums rock band and want to get a bit more 'fill' when mr. ld guitar goes wandering off into bidda-bidda-bidda-bidda land... I have a pretty decent rig and a 5 string bass so an octave box that does just the octave above woud be great - any suggestions? Kits?

my favorite is the digitech whammy cause it tracks amazingly, and does the octave up thing. other units usually only do an octave down and i don't like sliding up the octave and then letting a box play the octave i WAS playing.

Thanks Chuck - since building a coupla amps I'm more in the mood for making one... unless it's more ball ache than it's worth - any classic circuits worth considering?... :D

Classic circuits tend not to track well.

There's the Green Ringer, which is an octave up. Pretty ugly sounding.

For more modern stuff, there's the Micro-POG. I use one in my acoustic rig from time to time for faux 12-string and bass parts. It also does an interesting organ simulation.

i have one, but the power adapter needs to be fixed. other than that it tracks decent, but i haven't had good luck with EH pedals.

In general, I don't like E-H stuff either, but this fills a niche.

i liked it when it worked.