Hello All,I wonder if anyone has seen anything about this type of problem. Some of my aircraft, the PMDG NG and all my PSS among others, have completely lost all engine sounds (inside and out), where as others such as RFP 742 and the defaults are normal. All non engine sounds work fine.Also all ATC voice sounds have gone as well.I am hoping to avoid a reinstall, with all the hastle that involves.Any help would be much appreciated!ThanksPaul ( SPIM )System is P4 2.8 (533bus), Intel 865PERL mainboard, 1024 DDR333 RAM, ATI All in wonder 9700pro (128mbRAM), Soundblaster Audigy 1 platinum

Check your system's compressed audio codecs. Search the MSFS tips and tricks section at the top of this forum for LOST ATC | NO ATC.Your other problem may be that you deleted or removed an aircraft that the other aircraft sounds was aliased. Check the sound.cfg file for the aircraft that have missing sounds. See the method of aliasing by comparing the B777-300 sound.cfg file to the B737-400 sounds.W. Sieffert