Hi Bass,
Some informations:
atc_id=tail number (not visible on your screenshot)
atc_airline=navy (must be recorded in the airlines.cfg file)
atc_flight_number=F4U (I usually use the aircraft reference, you can put what you want)
atc_type=GRUMMAN
atc_model=F4U
In this case, the ATC box and sounds will work correctly
Cheers
Philippe



