I used the same code as the Radio Shack voice prompter, set up with the aux button, What you have to do is make sure that if your system is hooked up in the rear, the monitor is set for that. Info button will switch you from tv to dvd. Pushing ok will play the dvd and the arrows will get you in the menu to set the system.
It is important to make sure that you are set correctly on the monitor. Otherwise the commands will not work. The button above MY DVR fast forwards through the chapters. The arrow above record will get you in timer and item menu.
Basically, I hit buttons to see what they will do.