To record a voice narration, you need a sound card, microphone, and speakers. 

1. On the Outline tab or Slides tab in normal view, select the slide icon or thumbnail that you want to start the recording on.
2. On the Slide Show menu, click Record Narration.
3. Click Set Microphone Level, follow the directions to set your microphone level, and then click OK.
4. Link the narration:

You have a choice to either link or embed the narration.

·         If you embed the narration, the narration sound file becomes part of the presentation and it travels with the presentation. However, embedding the narration results in a large file size. 

·         If you want the file size to be smaller, you can link the narration. The file is then stored where you specify on your hard drive and plays with the presentation. If you present the show on a different computer, you must carry the linked sound file with you and install it on that computer. A linked file will also play faster.
Link the narration

• Click OK.
   

5.  Select the Link narrations in check box, and click Browse. 
6. Click a folder in the list, and then click Select.
7. Click OK.
8. If in step 1 you selected the first slide to begin the recording on, go to step 6. If you selected a different slide to begin the recording on, the Record Narration dialog box appears. Do one of the following:

• To start the narration on the first slide in the presentation, click First Slide.
• To start the narration on the currently selected slide, click Current Slide. 
9. In slide show view, speak the narrative text into the microphone, and click in the slide to advance. Speak the narrative text for that slide, advance to the next slide, and so on. You can pause and resume the narration. 
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   • To pause and resume the narration, right-click the slide, and on the shortcut menu, click Pause Narration or Resume Narration. 
10. Repeat step 6 until you've run through the slides, and when you come to the black Exit screen, click in it.
11. The narration is automatically saved, and a message appears asking if you want to save the timings for the show as well. Do one of the following: 
    • To save the timings, click Save. Your slides appear in slide sorter view, with the slide timings shown below each one. 
    • To cancel the timings, click Don't Save. (You can record the timings separately.)

Note   In your presentation, only one sound can play at a time. So if you have inserted a sound that is to play automatically, it will get overridden by voice narration.