I have the program too, I have not found a way for that to happen.  there is a much more thorough program out called Radar Contact, that one allows the VCP (Virtual Co-Pilot) to fly the aircraft and answer radio calls.  also you can declare emergencies etc... only problem is it's $45.  anyways, sorry I couldn't help with that problem. Have you figured out how to add your own sounds in FDC? and play them back during the flight?  Like Ladies and Gentlemen, we are running a few mins. behind etc...?  let me know thanks.