Anyway, keep in mind that I don't much at all about autoit scripts. Still, looking at your code, you're doing +1 to the string length which is probably adding an extra "garbage" character to your command being sent.. this could prevent RR from interpreting the command from what it's supposed to be. A quick test would be to send a multi-command like PLAY||NEXT chances are that if the garbage is the problem, the first command would work and the second would not.