Yup, got it thanks. I had done this before, but had forgotten until now about it.
Related question: Now it works, i.e. the first slide comes up and the sound starts to play, and does so throughout the presentation. However, I find that if I want to review the presentation, I have to do so from the beginning, if I want to hear the sound play the "right way." In other words, if I jump to the middle of the presentation, I don't hear the sound file associated with that point. The sound starts at the beginning even if the slide presentation doesn't.
Is there a way I can do a virtual "recording" of the presentation (like a videotape or DVD) so that no matter where I start the presentation, I will hear the right sound? Thanks.
To answer your first paragraph, PPT doesn't have an audio timeline where you can fine-tune the association of sound and slide. The only way would be to chop up (create several sound files from) your original one - one for each slide.
There are several software products used to create computer-based/Web-based training that can import PPT slides, and which do have audio timelines (such as Adobe Captivate). However, the output would be a Flash file or an EXE, not a PPT.
To answer your second paragraph, Microsoft does have directions on how to "storyboard" a PPT to video/DVD. But it's complicated, and you can't add sounds until AFTER you've futzed with the PPT:
http://office.microsoft.com/en-us/powerpoint/HA100597371033.aspx?pid=CL100626991033