When I play a sound through the QAudioOutput (which does not provide a setVolume method) the volume of the sound depends on the current system setting. For instance if I set the volume in the N9 music player, then the volume from QAudioOuput is also changed.
Is there a way to change the system volume somehow (using the volume keys changes only the ringing volume but not the device's volume used by QAudioOutput)? I also found the "Phonon:AudioOuput" class which supports setting the volume but I don't know how I can connect this to the output of my QAudioOutput implementation.