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* It is possible that your HDMI does not support the audio channel, consider replacing the HDMI cable.
* It is possible that the motherboard of the controlled computer does not support audio output via HDMI, if so, you cannot use audio unless you replace the motherboard;
* Did you use a VGA to HDMI adapter to get the HDMI signal?
* Refer to https://docs.pikvm.org/audio/ for more details and technical limitations related to audio.