My Shaw remote is programmed to control the TV, including the volume.
Using the Setup-9-9-3 command, I can redirect the volume control to control the Motorola 3510's volume setting. This works successfully, and when I press the volume keys, an on-screen volume display appears from the set-top-box, rather than the TV, as expected.
However, the volume is set to about the middle position and can only be increased by just one bar from there and no further. It also cannot be turned down.
That is to say, you can toggle the volume between about middle and middle + 1 bar; the parameter will not move outside of this narrow range.
What is with that?