Currently Being ModeratedMar 6, 2013 10:39 PM (in response to davbee)
Welcome to the forums.
It is possible to add a voice track in iMovie, but not in iDVD.
With professional DVD software, supplemental audio tracks can be incorporated into a DVD and would be selectable by a user. iDVD does not have this capability, nor does it handle captions (unless they are permanently added to the video track before the video is imported into iDVD.