This is possible now with realband. I just did On Green Dolphin St., bossa to swing. In realband, lets say you start with a piano track, highlight the measures you want to be bossa, pick one of the the the piano bossa realtracks and generate. Now highlight the next section. If you want the piano to play swing, pick a swing piano realtrack and generate. Continue through your track in this manner till your thru your tune. Do the same with your bass track. Realtracks has a 4 only bass which does the walking. Be sure to match your tempos when you choose realtracks. There is a bug with the bossa to swing drums in realtracks. They leave blank measures at each part marker. The workaround-generate the drums in band in a box and import into realband. You'll get a lot more help if you post in the regular BiaB or Realband forums......Bobby This method does not use a style to generate the tracks.