I can easily enough throw the audio file into Audition, slow it down by the appropriate amount and make a backup of the American DVD that I own with this as a secondary audio track, but I do not know the conversion factor precisely. Would I just slow it down by 4%? Would that mean that the converted audio track should be 96% as fast as the PAL?
EDIT: I seem to have gotten this taken care of. Sooooo, nevermind
