Hi all, I have a Samsung blu ray 5.1 surround system and I have just noticed that if I connect the optical cable from the digital out on the t.v to the optical input on the surround system and set the sound on my computer to HDMI everything connected to the t.v via HDMI comes through the surround system on the digital in setting, is it still possible for me to get full 5.1 from my pc and sky box this way?