When working with adding sound within PowerPoint — be it adding sound to an animation or even adding sound to a slide transition, you’ll realize that only WAV files can be used as sounds in either of these scenarios. What’s more — the same WAV file is always larger in size than its MP3 alternative and since animation and transition sounds are always embedded within PowerPoint, you can end up with really large PowerPoint file sizes! Note that adding an MP3 file for animation or transition sounds is normally not doable since PowerPoint won’t accept a file that has an MP3 file extension — that’s unfortunate because MP3 files can be almost 10x smaller than WAV files.
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