none.
I hesitated to answer, but that's the truth. Don't own a bass amp. When recording I go either direct or through a DP/4+ that I got when I was working at Ensoniq. Created some nice tonal things to use with that.
The only live playing out I do with the bass is at church, and they have something there (not even sure the brand) but it's angled like a monitor and plugs into the board.