Strangely, the landing gear-up/down sound effect for one of my FS aircraft has stopped working.  Upon checking the "sound" folder, the .wav files are still there, and the names have not been changed from the default.  Thought there may have been a problem when updating the entire aircraft file (as this is a project I am working on, and update periodically).  Have even tried substituting the sound files with those borrowed from other aircraft, and stripping then reinstalling all sound files associated with this aircraft, as well as verifying that the gear sound parameters are still listed within the sound.cfg file.  Yet the landing gear still refuses to make any noise when deployed, even when the exact same sound files do work with other aircraft (verified by doing a copy & paste).  This has only happened in the last couple of weeks or so, is complete mystery and I am wondering if anyone may have an idea how to restore things to normal.  

Thanks - Brian

Thanks for the suggestion, I have not only checked the sound.cfg file to ensure the sound files are still in there, but also verified that the sounds still play on the media player (and file names remain as per originals).  Also tried copying the entire sound folders from numerous aircraft, while using the current aircraft.cfg file, and the gear still won't make noise.  Strangely enough, when re-loading the FSDS model using Abacus FS Editor, and using any other aircraft, all of their sounds do work, it's only when I make adjust the aircraft.cfg file that the problem starts.  Is there any place in there that may affect any sound files (nothing obvious found)?  Thanks again -