svn should once again have working (better than before the libsndfile changes) support for tape tracks. what a total pain this has been, but i think the end result is worth it - a standard library shared with other apps. let me know if you have issues with it. it may not work with existing sessions that have old BWF files in them - still checking on this here.
i will check SMPTE offset tonight, and then i'm back where i was 10 days ago, finally :(