Thanks this thread has provided valuable information for me as well. I tend to look specifically for midi instruments within BIAB if that's what I want to open in Logic. Usually I find something. I'd be extremely reluctant to start playing with flextime etc in Logic to shape Realtracks.

If using a custom midi file, remember you have to freeze the track before exporting to get around a glitch currently in the system. I started a thread about it down below in the Mac forum.