Hello Xavier, hello Brian,
may be I can add another experience which may help to solve this problem.
When I fly the Barnstormer-Scenery between Tetachuk Lake and Detna Creek, and I come closer to the hill where the Fire Tower is up, the sim freeze and the image gets grayed out for a few seconds. What happens with the sound at that moment I can´t remember anymore; I never mind about that minor issue, I just didn´t fly in that particular area anymore for that reason. When I do things like clicking with my mouse into the image or try to change the view, there is a chance to overcome that and the sim is fluid again (sorry for my english!). I tried this a couple of times, always the same and ONLY in that area, no one else in the vast areas of RTMM or ORBX land! that are the only areas I fly in.
Hope, this may help a little bit to solve the problem! Cause I took a look insight the scenery folder and there are too a couple of FX_xxx_sound.bgl files
And by the way, thanks for your phantastic sceneries Xavier.
AND a happy new year to all here at RTMM (phantastic site and fabulous work!)
Cheers Rainer