Thanks, 3FG, for that great reply. I'm trying to follow these steps with the Comcast remote with the red button. I can get the master code 20752 to work and I'm trying, now, to program the power button. Do I understand you correctly that the way to do is to use the 994 Command and try every code from 000 to 255 to see which of them (if any) is the volume command? Is there such thing as a table that tells you the codes for various commands? Or, to put it another way, how did you know that EFC 00169 equated to Vol+-- did you draw this knowledge from a bank/database or did you figure that out by trial and error?

Thanks!