An audio track embedded in a slide, can be trimmed directly from Powerpoint (at the beginning and end of each clip), without the use of any third party software:
On your slide, select the audio track:
Go to "Audio Tools" > "Playback" > "Editing" section.
Click on the "Trim Audio" button:
In the "Trim Audio" dialog, use the green and red slider to trim your audio.
Alternatively you can adjust your settings via the "Start Time" and "End time" Field.
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