Adobe Premiere Elements 12 - Manual (Page 81)

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boundary between thumbnails as the actual boundary between frames. Think of the thumbnails as a storyboard or sketch of the clip’s content.
Click the Set Video Track Display Style button or the Set Audio Track Display Style button at the left corner of the track. Each time you click,
the track’s display style toggles to a different view.
To see more volume detail when viewing an audio waveform in the Expert view timeline, increase the track height.
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