Record a Voiceover
You can use the iMovie application to augment the audio portion of your movie with a voiceover. A voiceover is a voice recording that you make using audio equipment attached to your Mac.
A voiceover is useful for explaining a video clip, introducing the movie, or giving the viewer background information about the movie. To record a voiceover, your Mac must have either a built-in microphone, such as the one that comes with the iSight or FaceTime HD camera, or an external microphone connected via an audio jack, USB port, or Bluetooth.
Record a Voiceover
If your Mac does not have a built-in microphone, attach a microphone.
Note: ...
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