spirit of gamer EPIC Serie Manual Del Usuario página 23

DISPLAY
Aspect ratio: Change the aspect ratio of the image to 21:9, 4:3 or 1:1.
AUDIO
Mute :enable or disable to mute the audio source.
Volume: Change the audio source volume from 0 to 100.
Audio source:audio source interface switching HDMI1, HDMI2, DP1, DP2.
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