The more I think about it, they should be able to play it direct from disk, so what ever chord is entered on your midi keyboard it will play that section in the files.
Just like Kontakt will play the samples of the notes you play,
or UJAM Virtual Guitar/Drum VSTi will play the phrases for each Chord you are playing on your keyboard,
so if I load UJAM Bass, UJAM Rhythm and UJAM Solo they will all follow the chords I play. So Biab could do the same, just as UJAM plays direct from the large sample libraries, it would load all the track data of all the RTs & RD of the style you choose and that is the sample library it plays from.

Below is a video demo playing a RealTrack file direct from Biab USB disk, Biab would read the data for the RT/RD files of the style.
https://www.dropbox.com/s/n83ve8lpfml0efb/RT-Play-from-Disk.mp4?dl=0
So the data would be something like the csv region data in Reaper for the RT file below with start and end point in the wav/wma
AcG011.csv
AcG011.wav
Code:
#,Name,Start,End,Length,Color
R1,A,1.1.00,3.1.00,2.0.00,FF80C0
R2,A,3.1.00,4.1.00,1.0.00,E41A27
R3,E,4.1.00,6.1.00,2.0.00,E41A27
R4,A,6.1.00,8.1.00,2.0.00,E41A27
R5,E,8.1.00,10.1.00,2.0.00,E41A27
R6,D,10.1.00,12.1.00,2.0.00,E41A27
R7,E,12.1.00,13.1.00,1.0.00,E41A27
R8,F#m,13.1.00,15.1.00,2.0.00,E41A27
...
...