I have the tascam bass trainer and used it with my StingRay when I had it. No problems really unless you boost the hell out of the pre on the bass. Even then, if you lower the volume you'll be ok.
Its a handy unit, but the only feature I really like is the VSA (variable speed audition) The bass boost, enhance dont really help the bass stand out that much as much as they muddy up the mix with the low frequencies, and a lot of kick drum. The bass cut is cool if you want to come up with your own ideas unless the bass in the recording has alot of treble, in which case you'll still hear it.