Bob, you give a very good explanation of what I needed and I was relieved to know that my feeling of 'chunkiness' was not just my own lack of knowledge RB. It was also nice to realise the difference between 'Generate' in BIAB and RB. I had not been using the 'Generate' button at all. Each track (or part) had been generated individually from the selected style.

In this case then, say I generate a part of Track x with Style 1 and another part of Track x with Style 2. Because, in each case, I have had to load the related style into RB, if I go back to the part generated with Style 1, will I have to load Style 1 again to Regenerate that part? Will it remember the part the Style that generated it? I'm thinking not, so that means recording the styles for each part.

But cxp has pointed out that you CAN solo the instruments of a style if you use StylePicker in BIAB, so if my chord sheet is loaded into BIAB then I can at least audition the instruments in a more structured approach. I have done this now and it really is great. The Stylepicker looks the same as RB but the window showing the instruments contains buttons that allow me to solo a specific instrument. Now I can test that solo with my actual chords. And whats more, I can, while it is playing the song, select another song and play again and the new instrument will play again. This is still a bit clunky, but boy, its light years better than having to tackle it from RB. It just means that both BIAB and RB open at the same time.