Factors influencing the automatic generation of the midi score of an instrument

Generating a midi score is tedious, and the automatic generation of BIAB can be a good place to start.

So that the score generated by BIAB is closest to my needs, I would like to have a little visibility on the factors that influence this generation.

Obviously, the style of the track influences, but I suspect that there are other factors, like maybe the instrument affect to the standard track ...)
If the matter with the track is taken into account, is it the initial instrument of the track (Piano, Guitar ...) or the instrument currently at the track ...?

Is it possible to know a little more about the factors which condition the generation of the Midi track, so as to be able to influence the Midi stream generated automatically?
I would like for example to be able to force the creation of chords or arpeggio depending on the case, to be able to influence the duration of the chords (one per measure, or 1 per beat) ...


Thank you for your attention