Thank you Mario. I have basically done what you say: BB midi to Sonar and then use the Sonar sound source. It worked OK for the bass sound, except that when I compare the BB midi piano roll to the Sonar piano roll there are some differences. However these can be fixes in Sonar to reflect the same as the BB original.
The problem that has crept up though is that I tried to do the same with an acoustic guitar part. When it is transfered to Sonar, I end up with a single continuous note in midi. Could this be a problem with the instrument, because I used the exact same process as with the bass.

Thank you.