Add or delete audio in your PowerPoint presentation
Add audio from your PC
Select Insert > Audio.
Select Audio on My PC.
In the Insert Audio dialog box, select the audio file you want to add.
Select Insert.
Record audio
Select Insert > Audio.
Select Record Audio.
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Type in a name for your audio file, select Record, and then speak.
Note: Your device must have a microphone enabled in order to record audio.
To review your recording, select Stop and then select Play.
Select Record to re-record your clip, or select OK if you're satisfied.
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To move your clip, select and drag the audio icon to where you want it on the slide.
If you’re using more than one audio file per slide, we recommend putting the audio icon in the same spot on a slide to find it easily.
Select Play.
Change playback options
Select the audio icon and then select the Audio Tools Playback tab. Then select which options you'd like to use:
To trim the audio, select Trim and then use the red and green sliders to trim the audio file accordingly.
To fade in or fade out audio, change the number in the Fade Duration boxes.
To adjust volume, select Volume and select the setting you prefer.
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To choose how the audio file starts, select the drop-down arrow and select an option:
In Click Sequence: Plays the audio file automatically with a click.
Automatically: Plays automatically once you advance to the slide that the audio file is on.
When Clicked On: Plays audio only when the icon is clicked on.
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To choose how the audio plays in your presentation, select an option:
To have the audio play continuously across all slides in the background, select Play in Background.
Delete audio
To delete an audio clip, select the audio icon on the slide and press Delete.
Source: Microsoft