You have UJAM, you have NI Session Guitars these work as Live Arrangers, you have Ketron Live Arranger Keyboard. They have SOURCE files.
There is no reason why Biab cannot do the same from SOURCE files. Did you even try the SFZ files I uploaded ?
If you have no interest or understanding in Reaper then you can't help with Biab, and certainly not with Logic and iPad, again the writing is on the wall.

If you want business as usual, keeping Biab in the time warp past, then please by all means, keep doing what you are doing and don't look deeper into things, limit it all to the limit you know, don't go beyond whatever you do, heaven forbid if you wake up in the middle of the night with a revelation.
If anymore users come here with ideas that are beyond your limit of understanding, get rid of them, that'll work, that is the best thing to keep it way behind.
Don't seek and you will find, Don't knock and it will be opened.