By adding narration to the slide you can add your own voice to PowerPoint presentation.
1. Choose Insert > Movies and Sounds > Record Sound
2. Type a name for this recording in the Name box.
3. Click the Record button - (the red dot) when you are ready to begin recording.
Click the Stop button - (the blue square) when you are finished recording.
Click the Play button - (the blue triangle) to hear the playback. If you do not like the recording, then simply start the record process again.
4. When you are happy with the results click OK to add the sound to the slide. The sound icon will appear in the center of the slide.
When you use this function, the presentation will go to the full-screen mode, it's a little unconvenience to operate. I find a good tool to help you, it's free for you to use the feature of recording narration.
PPT to Flash Converter
, an add-in of PowerPoint, you donít need switch to full screen to record the narration. The mini record narration window is at the bottom right of the window. It is very easy to record narrations.