I have an Onkyo 609 connected to a Panasonic TX-P46GT30 with an HDMI arc lead plugged in to HDMI2 and a Digital Optical cable connected to Digital 2 on the Onkyo. The TV talks to the Onkyo in that when I turn the TV on and off the receiver responds and I am getting TV sound through the receiver. Although the Home Cinema volume bar appears on screen and goes up and down when I operate the TV remote the sound does not change. What have I connected wrongly.