Powerpoint with audio

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I'm trying to convert a presentation to Powerpoint and have the images and slides all set. So step one of this is done.

Now I need to play back an .mod audio track as the narration for this slide presentation and would like to time the slides to coincide with the audio. Hopefully when finished, I would save this thing and basically have a file that would be clicked open and from there, require no action from the person doing the viewing as the slides progressed at a rate preset by the narrative track.

So, would it be best to set a mic by a speaker and let that handle the audio for the narrative portion? Thoughts are very much appreciated. TIA