Hi Richard,glad you liked the tune.
I use Reason 6.5(got the upgrade for one dollar!).
The BIAB midi and real tracks were quite easily exported.
I saved the song as a midi file with the option for saving the real tracks.
Also made sure to save midi drums on separate tracks as well.
Opened a new blank Reason project and just imported everything in two steps.You should first be sure that the real track files match your Reason project/settings as far as bit rate etc.Also you should set the Reason project to the same BPM as what your BIAB song was.
After importing ,I tried various Reason Refill sounds for the piano until I settled on The Mrs mills one.Since I had also saved the real drums as a midi file I was able to add a bit of Reason bass drum to oomph that end up a bit.Then just added my vocals and organ ,guitar and bass playing.Muted some of the pedal steel and piano where it seemed appropriate.Hope that helps.Reason and BIAB are a good combo for me,though BIAB probably works well in conjunction with any DAW?
Regards,
Tony C