applicationMusicPlayer volume notification

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I don’t know where the docs says so, but if you add a MPVolumeView view to your app the system volume overlay goes away. Even if it is not visible:

- (void) viewDidLoad 
{
    [super viewDidLoad];
    MPVolumeView *volumeView = [[MPVolumeView alloc] initWithFrame: CGRectZero];
    [self.view addSubview: volumeView];
    [volumeView release];
    ...
}

You can use the hardware volume buttons, the setVolume method or directly interact with the control (if visible) that the overlay doesn’t show up.

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