iOS 4: Remote controls for background audio

The documentation examples are a bit misleading, but there is no need to subclass anything anywhere. The correct place to put remoteControlReceivedWithEvent: is in the application delegate, as it remains in the responder chain regardless of whether the app is in the foreground or not. Also the begin/end receiving remote control events should be based on whether you actually need the events, not on the visibility of some random view.

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