This should help: http://www.pptalchemy.co.uk/keep_playing.html

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> I have created a slide presentation using PPT 2007 and wish to link a sound
> file which was created using Cubase. The sound file is saved as a wav file
> to my desktop. When I insert the file to the presentation the slides do not
> advance (timing has been preset). How do I link the sound file to the
> presentation so they play simultaneously?