I'm setting up a MX-900 for a client who has an older RCA RT2300 Receiver. They no longer have the remote. The codes in the database work with the exception of the power commands. The Rcvr will power up with a source selection, but I can't shut it off. I tried the ccf files in the Pronto section with no luck. The client has a proscan remote that when the power button is pressed 2x within 1 second will turn off the amp. The second button press sends out a 1-2 second IR command that I assume is a global off for multiple devices. The 900 stops learning well before the end. Any suggestions?