AOC GH300 User Manual page 22

8.2.1 SPEAKER
⚫ VOLUME
CONTROL (Default MASTER/FRONT= -20dB, LOCK=Enabled,
MUTE=Disabled)
You can either adjust the volume of the master speaker (MASTER), or adjust the
Left/Right side speakers (FRONT L/R) individually.
MUTE button can mute the whole master speaker.
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