copies the audio from the source clip into a new file
that you can edit in Soundbooth. The new file appears in the Project
panel in Adobe Premiere Pro and opens in Adobe Soundbooth.
Note: Extract
Audio doesn’t replace the original audio in a video master clip.
If you add the video master clip to a sequence and you want the
edited audio to accompany the video, you need to unlink and delete
the audio from the master clip, and then link the remaining video
with the edited audio.