I lose ATC communication sound when loading PMDG aircrafts of NGX or 777 but the text does scrolling completely, and I also experience same problem for Aerosoft AES, losing sound. All other sounds of aircraft such as engine, warning etc are normally exist. I dont get this problem with other aircraft addons or default FSX aircrafts, only with PMDG addons. is there any different sounds setting in PMDG that makes this happen ?