I use RealBand and Sonar.

Let's say that I need some Acoustic guitar for an 8 bar bridge,
then I put in the chords in Realband and mark 8 bars in the track window.
Right click and generate Realtrack, then drag n drop into Sonar.

Even if I want a Bass for the whole song, I like to brake it down to parts.
Then I can take a Bass that fits best to that part.


Eric