To clarify, it is my understanding that BIAB does not allow for a RT chord to be played in other than the range(middle C example )it's recorded in because there is no way to notate something like c3 position or have a RT recorded.
Am I correct on this?

If this is true, it would seem possible, because these are audio files, to expand the range of RT's, at the time of artist recordings, much as sampling is done and an addition in programing so C would be middle C, C1 up an octave c2,c3 and so on.
Please excuse what might be a naive approach or ignorance of BB's possibilities or limits or mine
Thanks just thinking out loud on the keyboard
Wyndham
BTW I know some RT's are listed as high track