Reaper and BiaB

Hi Experts,

Reaper and Band in a Box are the two musical programs I use.

Sometimes I would like to type in some score.

Of course Reaper does not have a built-in score editor but you can write and/or import Midi tracks.

BiaB seems rather special when it comes to score editing. It does work, but it (of course) is closely tied to the ways of BiaB. E.g. (AFAIK) you can't do multi-instrument scores.

I did try "MuseScore" but did not get it working decently for me (supposedly due to lack of trying hard enough).

Dose anybody work with a combi of BiaB and Reaper on the same song ?

Is there a way of integration better than just export and import audio and Midi tracks ?

Any additional helpful information ?

Thanks,
-Michael