It is possible to add sounds to your presentation, although this can be a real pitfall. You might think a two-second sound clip that plays each time a slide appears is cute, but your viewers might not be as tolerant, and even the best sounds tend to grate after a few appearances. If in doubt, eave it quiet. However, if your computer has a micropho.ne you could record a voice narration to provide a commentary. First make sure your slides are set to change when you click the mouse by changing the Advance Slide settings as explained above.

In Powerpoint 2007, go to the Slide Show tab on the ribbon then on Record Narration; in Powerpoint 2003, this option is in the Slide Show menu. The default settings will be fine for most uses, and once you click OK the slideshow will start playing. Record a nan'ation for each slide and click when you're finished to move to the next slide. Once you're finished, Powerpoint will ask if you want to save your slide timings. Click Save. The next time you play the slideshow the slides will advance automatically, with your commentary played over the top. This is a good trick if you can't be there to present in person.