Hi we have purchased the hitachi 50HYT62U and have managed to set it up. We have it connected to sky and DVD player with 5:1 surround sound. When watching TV the sound comes through the 5:1 speakers but when we use the internet portal eg YouTube or Netflix the sound will only come through TV and we can still hear the TV channel we were watching through the surround sound. How do we get Netflix etc sound through the surround sound?