Unfortunately Sailfish doesn't integrate with QAudioOutput like it does with QMediaPlayer, so the volume control has to be handled manually by the app listening to volume key presses, which are only received while the app is focused. I've logged a bug for that in the new together site, so hopefully it'll get fixed at some point in the future: https://together.jolla.com/question/...-qmediaplayer/
<Morpog_PC> w00t, is this fixed lately? https://together.jolla.com/question/...-qmediaplayer/ <w00t> not yet, some work done on it, but it won't see the light until update8