What am I missing that makes volume special?

I have downloaded lots of Panasonic TV CCF files. So far as I recall, they all use the standard Panasonic TV code set. I didn't search carefully, but I didn't notice or recall any of them being missing the vol functions.

I did a quick search just now of my directory of decodes of downloaded CCF files and it saw 86 instances of the Panansonic TV vol commands. The first few were in:

[Link: remotecentral.com]
[Link: remotecentral.com]
[Link: remotecentral.com]
[Link: remotecentral.com]

In most CCF files those vol+ and vol- signals have been learned directly onto the hard buttons for vol+ and vol-. If you looked just at lcd buttons you would have missed them. Was that the problem?