Can't seem to have midi tracks play a real track using the PRT button,
I hear the correct real track when entering in the notation, but not on playback

Following instructions on pages 22-23 of the RealBand manual.

What am I missing ??

We found an issue which MAY be the same issue you're having. Until there's a new update, if you look in C:\BB\DX Settings\plugin_list_MIDI_X64.txt (assumes your BB is installed to C:\bb) and you see "SFORZANDO" in upper case, it could be causing the issue. Just replace with all lower case and it may fix the issue if it's a sforzando issue.