Mute
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Muting the audio
Press and hold the VOL + and VOL - buttons at the same time until 
appears on the screen.
To restore the original volume, press the VOL + button or the VOL - button.
Mute Automatically
You can mute audio from the system's speakers when headphones are disconnected from the headset jack. To enable this setting, select the checkbox to set a checkmark. You can hear audio by pressing the VOL + button or the VOL – button.