I think so. I assigned the Drums and RealTracks folders manually in the respective settings. I can select a RealStyle for a song and when I press the play button, Biab starts generating the song without complaining, and I can see in the title bar the progress when Realtracks are retrieved. So yes, this seems to be configured correctly.

As far as I know, both, sound output from Coyote and ReaTracks sound are passed to the MME interface and then from MME down to the low level drivers, in my case either pulseaudio or alsa, whatever I configure in wine.

I wonder whether there is something special with RealTracks what the wine MME implementation cannot deal with. If I would know, I could perhaps ask the wine guys whether this could be fixed.