We just bought an Insignia NS L55X 10A and hooked it up to our blue ray player, cable box and stereo with HDMI cables and the digital audio cable goes from the TV to the amplifier but when we adjust the volume on the TV, it will not adjust the volume on the audio out. The speakers on the TV adjust but the sound coming out of the TV through audio out to the amplifier remains at full volume. What do we do?