Sony 4-153-621-13(1) User Manual page 129

Playing Audio Files
To close the Playback screen
Press the OPTIONS button to display the Option menu, and
tap "Return to List."
Hints
 You can read a book while playing tracks. To do so, play the track
before you begin to read a book.
 You can display the Option menu of "Audio" by pressing the
OPTIONS button (
 While a track is playing, the volume indicator appears at the bottom
right of the screen.
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