The HDHomeRun app supports digital audio out to your TV or home theater system on many Android TV devices. When using digital audio out the TV or home theater system is responsible for the volume control.
If you TV or home theater system supports CEC control go into Settings, System, Volume Mode, and select CEC volume control. The Android TV box will signal your TV or home theater system to change the volume.
To disable using digital audio out (and get volume control without needing CEC support) go into Settings, HDMI, Surround sounds pass-through, set to Off. Then restart the Android TV device.
Frequently Asked Questions
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