I have a Sony Stereo Receiver which doesn't have an optical audio port. Currently my stereo is connected to the cable box, which is connected to the TV via HDMI. Apple TV is connected as well via HDMI, but I can't get stereo sound through my speakers. Is there any way to configure the setup so I can get sound coming through my receiver/speakers when using the Apple TV (without optical audio)? I do have an optical audio chord though, which I can use if necessary.