OK, here's the skinny. I tested with all plugins removed and shut off custome scenery plugins (darn, there's alot of those!) . I was still getting the strange sound upon landing, even lighly beyond 200fpm, but once I swithched from the 172sp to the 747,even if I came in at 700 per minute (hard landing!), it was all good...no strange sound. btw, that crashing strange sound is definately the boom1 in the sound file in all sound files on xplane. Funny I don't hear the skid sounds in soundmaxx file structure for the 172. And furthermore, I AM getting the ambiant sounds now! (Yay!) I further tested with the plugins replaced and it seemed like the crashing sound with the 172 didn't show until I was landing well over 200feet-pm, less than 300fpm.... Just the normal chirp hitting the runway. Repeated tests it sometimes did 'boom1 sound but alot less than before. I attached log files. normal with plugins and the other named (log no plugims). Also noticed I can hardly hear the flap sound in the 172...the 747 is very loud tho. I haven't tested it in thunder storms or turbulance and will do so next go around. I did, however, go thru some crosswind landings at TUPJ, didn't notice any wind or I was just unaware. I'm a gonna spin up my props again and see if these changes stayed. If not, I'll load up the 747 then back to the 172 to see if it repeats. And, ever since I bought MAX scenery at the org store way back and then skymaxx, I've been a very satisfied customer and your work is excellent. btw my log text attached shows not authorized! Failed: 404: (D:/xplane/X-Plane 10/Resources/plugins/MaxxFX/product_registration.png) Gizmo64: gizmo_loadPngImage(...) I'm sure with SoundMaxx I'll be an even happier camper. Thanks for y'alls input. I really really appreciate it. ciao The Doctor Log.txt log no plugs.txt