I have just bought a new Panasonic Viera TV TX-48AS640, I am trying to connect my Virgin TV TiVo Box and Sony DAV-TZ140 to it. I have high speed HDMI from TiVo to TV (port 1) and high speed HDMI from Sony to TV (port 2, ARC). I cannot get any audio through home theatre speakers when watching TV channels through TiVo box. Could do with some help please!!