You could theoretically use any guitar amp model for your bass, but don't forget that there is a Flip Top bass amp model in there, too.

I have a patch, I'll see when I can upload it, that combines that with the Bassman, and I stinkin' love it. If you want to hear it, check out this little song I threw down with it:

www.soundcloud.com/hitchface/steak-chili

I recorded it with a cheap active Ibanez.