Pulseaudio doesn't set volume level on playback, if there is another audio device
If there is an additional audio device (USB Webcam with audio input device in this case),
on _every_new playing back of any sound, the volume level is set to value set with audioctl.
(audioctl set-control -d DeviceName volume XY)
Default audioctl volume level is set to 75%, when another audio device is available,
so it can act like having lower then desired volume output,
and if set to 100% with audioctl, then it is always playing on that loudest settings
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