Adding Audio to Your PowerPoint Slides

Step 1: Adding slide narration and slide timings:
With this method, you add a narration directly to each slide. When you save the presentation, the narrations and slide timings are saved also.
You will need to have a microphone attached to your computer. Load the presentation to which you wish to add a narration. To start recording, click on Slide Show > Record Narration > then the following window appears:
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You can set the microphone level and such if you wish. Otherwise, click OK to start recording your narration.
To narrate each slide, just speak into the microphone. To add a narration to the next slide, click the mouse and you will advance to the next slide. If you mess up, press escape and start over with the narration. You can restart with the first slide or the current slide you are on.
When you complete adding narration to all of your slides, press escape and a window will pop up asking “… Do you want to save the slide timings as well?” Click YES.

Step 2: Save your presentation and test it.