I have a Sony sony XBR65X750D Tv and a Sony HT-CT790 soundbar. I have connected my TV and soundbar via HDMI(ARC). I am trying to connect my macbook air and expecting to see the video in the TV and get the sound from the Soundbar. But I get the sound too from the TV. When I go to Action Menu -> Audio -> Audio Device. All speakers go mute. Is there a way to get this working?