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I know it's almost 5 years later, but 1013 (a Carver code) got my TiVo remote controlling volume and Mute for my Arcam receiver.
Thanks, Davisadm --Samsung TV codes plugged into the AV settings was exactly the answer! 0305 worked perfectly for my Samsung Sound Bar.
I've been having the same problem on my Roamio Pro. I had a tech over yesterday, showed him this thread, and he admitted he had seen the same...
I'm seeing problems with my Mini's remote, too. The pairing doesn't seem to stick.