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To set audio via the terminal
wpctl status
See your device in the list and then enter.
wpctl set-default 45
Change the number with your actual device.
To see the current volume: wpctl get-volume @DEFAULT_AUDIO_SINK@
To change it: wpctl set-volume @DEFAULT_AUDIO_SINK@ 0.05+
To mute or unmute:
wpctl set-mute @DEFAULT_AUDIO_SINK@ toggle