. . . but I couldn't tell you for certain when it's a POD or a real amp.
To be honest, I don't think about it 'cause I don't particularly care.
. . . on a record or CD, (not live), do you know if its pedal, modeler, or overdriven tube? Is there some specific quality to listen for? I don't think I can tell.
Bingo.There is a lot of studio magic that goes into the sound on a CD (any recording). So it is not really very easy to tell what was done.