Dare I say it?

Have you tried to play the bass part with either a bass guitar or a keyboard bass synth?

When I want a part and BB/RB won't cooperate, I will give plan B a shot. If you can pull it off, it might just be the faster solution.

Playing a bass line on a keyboard is not that difficult. And with either autopunch, or midi editing... mistakes are a breeze to fix.

That is my solution when BB just doesn't deliver the goods.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.