Volume Slider and Audio Device connection

[zgulser]

Hi,

What's wrong with;

Phonon::AudioOutput *audioOutput = new Phonon::AudioOutput(Phonon::MusicCategory);
	_ui.volumeSlider->setAudioOutput(audioOutput);

Phonon::AudioOutput *audioOutput = new Phonon::AudioOutput(Phonon::MusicCategory);
	_ui.volumeSlider->setAudioOutput(audioOutput);

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I can slide the volume slider but nothing seems changing in terms of volume.