You can find more information about this problem in Qt at 
https://bugreports.qt.io/browse/QTBUG-36511 
This was about QMediaPlayer, but the problem still exists for QAudioOutput and 
QSoundEffect.

A possible fix in Qt would be to check if the sink has flat volumes enabled and 
if it does, do software-based attenuation (in Qt).
That way, QSoundEffect and QAudioOutput volumes would always be relative to the 
stream role's volume.

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https://bugs.launchpad.net/bugs/1485522

Title:
  Volume obtained is 100% in multimedia sink for sounds from app

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