Hi francis, and welcome to the forum!

Most all of the Jazz styles, MIDI or RealTracks walk the bass in the "B" sections.

The part markers are those Blue and Green blocks overtop of the bar numbers in the chord view.

By default, BIAB will play the A subpart for the first chorus and then switch to the B supbart with walking bass for the 'inside' choruses, returning again to the A variation for the last chorus.

To get only the B variation part with walking bass for the whole song, just click on the blue part markers one time to turn them green, forcing B part for the whole song. Click again to remove, click again to start over with Blue.

A part marker also forces a Drum Fill that starts in the bar previous to the part marker. This is fine for most things because that's what a drummer will do when the song changes from one pattern to the next anyway.

Save song if you want it to load that way in the future.

Have Fun,


--Mac