As far as I know, the only thing you can do with it is input sounds from ReBirth into the Reason rack, thus being able to use Reason effects and such with your ReBirth patterns - but the offset for me is you cant really "control" the rebirth patterns within Reason itself (i.e you cant record and save a song if I'm not mistaken).
I'm going to dig more into this as I dive back 30 years into the early 80s with old school production techniques :)
