If the presentation is aimed at widespread dissemination of information then recorded narration is a good source of sound for PowerPoint presentation. With the aid of a microphone, an appropriate driver and a sound card, the narration can be recorded as a WAV file, which is saved on your disk and your presentation will be embedded or will link to it. Narration WAV files are very large, however they can be converted to ASF files, which are about 1/8th the size, by using Windows Media Encoder.
CD tracks can also be used as a source of sound clips for PowerPoint presentation. Unlike the recorded narration where the presentation is linked to the WAV file, which is played automatically each time the presentation is viewed, in the case of CD tracks, if you intend to hear music with your presentation, you will have to load the same audio CD in your CD drive. PowerPoint can’t tell one audio CD from another, therefore if by chance you put a different CD then you will hear a different tune with your PowerPoint presentation. Due to this major drawback of CD music source, an ASF file and link to that file is a preferred source of sound effects for PowerPoint presentation.
Available or recordable sound files are another source of sound for PowerPoint presentation. These file formats can easily be downloaded from the Internet and saved on the hard disk. PowerPoint does not recognize all sound file types, but WAV and MIDI are two of the types it does recognize. You can set the size of WAV and MIDI files. If the available or recordable sound file size is less than the limit then the file will be linked to the presentation. As soon as you activate the presentation, the linked sound file will also be activated. If you intend to transport the presentation to another computer or a storage device then do not forget to transport the linked sound files also.
With so many sources of sound for PowerPoint presentation, you can definitely create an effective and mesmerizing powerpoint background presentation.
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