hello and thank you for your prompt response.
I understand the operation of BIAB and PWT rb: They read a midi file and "offers" coaching. This support is visible on the windows "notation". BIAB displays chord symbols but PWT rb displays and agreements, but without symbols.
I also understand that "support" is not part of the midi file.
I confess, I seek ease. The idea is to create an additional track after "support", and this automatically.

To understand my problem, I invite you to listen to a midi file (I can send it by mail)
Initially, Listen with the PWT. Then listen to it in BIAB. the difference is very important.
I understand that:
In PWT, each track is individual midi file in IADB, the tracks of midi file is distributed and transferred to the tracks "solo, melody, strings, piano ... etc ...)
On mixing with tracktion3, I attribute to each track (PWT is the source) a plug of effect: Ex: "AmpliTube" for electric guitar tracks, "Addictive Drums" for the drum track ... etc. ...
If BIAB is the source, I could have, for example in the track ropes possibly plug "AmpliTube" any instrument. "AmpliTube" plug is only dedicated to the guitar

Here, finally my question: How can there have no difference between listening to a midi file read by BIAB and the same file read by PWT? You replied that I could turn off the style. Thank you very much, I knew we could do that.
But in this case, how are the tracks of midi file, and how to allocate my mix?

if I will use BIAB to the mix, giving each BIAB tracks ( "soloist, strings, etc. ..) the corresponding plug. ?

Please forgive me my broken English. You've probably guessed, I am French.

Again thank you