When I first connected the TV to Cox DVR Box, I did it thru the component cable that Cox gave me (5Male RCA plugs on each end-3 video and L-R Audio). Connected that way I could (had to) change the cable box channel with cable remote. So when I replaced component with HDMI cable, I got picture and audio as planned. But now I had to change the Volume with the TV Remote because as you said the audio output was constant from the cable box (I couldn't change volume with cable remote-only with TV remote. Since the cable remote has all the TV guide menus and DVR controls I figured I'd be using its remote for everything. And I can if connected thru component. Comprende?