I want to stream music from my mac to my hifi amp and speakers. Airport express is perfect but I'm also due to buy an Apple TV. Will the atv output optical into my amp and stream just like it does on the airport express? Only thing is I don't want to have the tv on to control it all. Perhaps just turn on the atv, plug in the optical cable and use the remote app? I have and airport express sitting right here so if anyone knows the answer please let me know before I open it and can't return it. Thanks!