Sony NW-ZX2 Manual page 38

Adjust the master volume quickly using the buttons (
customized volume control, see "Adjusting the volume."
Hint
[15] How to Use
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If there is no sound even if you press the buttons (
tap - [SETTINGS] - [
games, & other media] to turn up the volume.
Basic Operations
) on your Walkman. For more
), swipe the status bar down,
Sound] - [Volumes], and then slide [Music, video,
How to Use the Buttons