I'll bet that's true. I found that some of the codes in Apple 3 and some in Apple 2 worked, but I wasn't about to go through making a hybrid of the two just to see if they would work. One difficulty in doing that is that SKIP in one of those code sets works, but there's no working PAUSE or PLAY in that code set, so you have to put it in SKIP and then switch to the other code set just to stop it so you can test another button. Plus, I could see exactly how to make a unified file, but you have to do the entire thing in order to find out if it's worthwhile.

So, yeah, "all I have to do is" what you said. But when you start looking for what to do, it's not at all obvious or simple. I'll bet that the first time you tried to control an Apple TV 4K using a URC remote, you weren't able to just sit there and say "well, all I have to do is...."

AND the buttons are not placed in reasonable positions on the display, so they also have to be moved. So thanks for the advice, NOW I know it's simple to do. For anyone else in the position of working this out, now the Apple TV method is explained here at remotecentral, too.

You're welcome.