Hi there. I have just bought a Yamaha RX-V371 AV receiver and have it connected to a blu ray and a Humax Fox T2. I have all sound running through HDMI but cannot get sound with SD television channels. HD sound is perfect but when I change to an SD channel I have no sound at all. Any ideas or help would be gratefully received. I have managed a temporary workaround by connecting the sound through an optical cable, but would like all sound to come through HDMI if possible.