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1. Click on the control center icon  in the top right corner of the screen.
2. Click Sound.
3. Click on E464. The audio will now be routed through the HDMI cable to the NEC digital display. Audio controls on the Mac will no longer work; however, the NEC volume controls will work.
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Video

1. Click on the  logo in the top left of the screen. Choose System Settings. 
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2. In the menu on the left, choose Displays, and click on E464. 
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3. If you want to use the NEC display as an exact mirror of your Mac’s display, locate the “Use as” dropdown menu and choose Mirror for built in display.
4. If you want to use the NEC display as an extension of your own display, choose Extended display.
5. If you want to use the NEC display as your main workspace, using your Mac’s display as an extension, choose Main display.

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