Hey k1... I don't have an answer but I do have a question that I think you may be able to answer. Please forgive me if I've asked before but I've done most the work now and plan on authoring by end of this week, and I haven't been able to locate the answer on the forum. My question is, do you know how to author a dvd using multiple, selectable audio tracks? I have GarageBand, iMovie, and Final Cut Express. Is it something I need to do with those or use a different app? I'm trying to have one for the movie's audio, one for the RiffTrax (+movie, of course), and one for the isolated score. Thanks.