I'd appreciate help setting up a 12-bar blues backing track just the way I want it (in BB 2020 Win)...

Here's what I'm trying to do:

choruses 1 - 4: just the selected style track
choruses 5 & 6: adding soloist tracks
choruses 7 - 9: trading 2's with a soloist track
chorus 10: just the selected style track

I think that by selecting "mute melody in middle", I can inactivate trading 2's in choruses 1 and 10, and I think that adding soloist tracks for choruses 5 and 6 will (probably?) inactivate trading 2's in those choruses, but how can I kill trading 2's in choruses 2 through 4?

Thank you!

Do you want to use "UserTracks" or "RealTracks"

If using RealTracks, it's a matter of programming and only requires two tracks. One track will contain Soloist Instrument 1 and the second track will contain a Medley of both Soloist Instruments to Trade 2's.
Then, it's a matter of muting and un-muting the two Soloist tracks at the appropriate Chorus's.
It's a similar but different process if using UserTracks or MIDI.

Preparation using RealTracks:
If necessary, add your soloist instrument to the Style. ie: RT1530 Guitar
Add a second Track of that Soloist instrument. ie: RT1530 Guitar

From the RealTracks Picker, Select the 2nd soloist track. Select the Medley Button.
In the Medley Window, the first track of the Medley sub-mixer should have your soloist instrument, ie: RT1530 Guitar.
In the 2nd track, select a Soloist RT to be the 2nd Soloist instrument for Trade Two's.ie:RT1956 Sax.
In the Medley Window, select '2 Bars'.
Ok to exit the Medley Window.

Program the song.

.choruses 1 - 4: To play just the selected style track.
In Bar Settings.
Select Chorus 1. Mute both of the Soloist Tracks at Bar 1.

.choruses 5 & 6: adding soloist tracks.
In Bar Settings.
Select Chorus 5 - Un-Mute the Soloist 1 Track at Bar 1. Plays the Soloist lead Guitar.

.choruses 7 - 9: trading 2's with a soloist track.
In Bar Settings.
Select Chorus 7 - Mute the Soloist 1 Track at Bar 1.
- Un-Mute the Soloist 2 Track that has the Medley Programming at Bar 1. Plays the Guitar and Sax.

.chorus 10: Play just the selected style track.
In Bar Settings.
Select Chorus 10 - Mute both Soloist Tracks at Bar 1.

Charlie, you set me up perfectly! Thank you, thank you, and thanks again!!!!

Glad to help. The real thanks goes to PG Music for including such a useful and great feature into the program years ago. BIAB is great software.