Found this thread after spending an hour or two trying to figure out why leadsheet tab was missing for the bass.
Not at all obvious.. I can substitute in another bass but the regenerated realtrack is new, to match the style of the new bass style.

Question: if I am using e.g. 903 (Smooth cool jazz, sw16) that doesn't have notation, and want to write down the generated bassline, do I have better options than just listening and transcribing like we used to do in the olden times?