Brilliant! Thanks for posting that. This means I could create my own arbitrary IR codes within Crestron, to teach the ATV. The dilemma will be what data to enter, although to be honest I would probably just pick a random IR module from the Crestron IR database, for a device I'll never own or use (say, a VCR), and use its signals. It will be fun to see what other discrete functions can be selected.

thanks @77W!