Thanks very much for the reply

Ok, I've narrowed down the problem a bit. Instead of using bandstand to render the track I selected the VSC DXi, and the track renders properly.

Problem is I really want to use Bandstand, it sounds *way* better than the VSC! I use bandstand all the time from within BIAB to render midi data to audio and it works great, it seems that maybe RealBand does not properly support Bandstand???