The 'older' RTs installed with 3 different versions for each instrument. From what I can tell, they are the same phrases but transposed. BIAB uses these when generating a RT. If you have those, look in the folders and you'll the three for each 'phrase' The variations will have either a +/- following the file name. I don't know how they generated these but it may help if you listen to the variations in a media player.

The new BIAB RT engine seems to do a great job transposing thus eliminating the need for the +/- files.

R