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Digital audio ouput - why no volume contr… - Apple Community
https://discussions.apple.com/thread/1214940
Well I connect my iMac to my surround sound system using an optical cable, which makes use of the digital-out signal, and as Paul says, the volume control in iTunes does indeed alter the volume being played, so the volume must be being carried along with the digital signal.
How to Use Your Mac's Media Keys to Adjust Speaker …
https://www.macrumors.com/how-to/use-mac-volume-keys-adjust-monitor-audio/
How to Enable Mac Volume Control for HDMI or …
https://lifehacker.com/how-to-enable-mac-volume-control-for-hdmi-or-displaypor-1793607216
FIX: Cannot Adjust Volume on a Mac OS X with External ...
https://appuals.com/cannot-adjust-volume-on-a-mac-os-x-with-external-devices/
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