See if this halps at all:
http://www.pptalchemy.co.uk/loop_sounds.html

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> I'm running a presentation in Kiosk mode and I wish to have music playing as
> part of the presentation. How can I prevent the music from resetting itself
> to the first track when the the presentation reaches the last slide and loops
> back?
>
> The product is Microsoft Office PowerPoint 2003.