Hi,I had a lot of stutters on my system. Finally I did find the main reason. I did use planes which are patched FS2K2 planes using FSSOUND.DLL.After having read almost all threads concerned with stutters, tweaked in every way my ASUS A7N8X-X AMD 512M GEFORCE 5600 XT 128 MEG on a computer only dedicated to FS9 Outside view ( almost all WIN2K Service off) I lost hope and did make a tour with the standard Learjet.Everything was as smooth as it can. No stutter at all and a steady 25 FPS, on the same route I made just before with the Aerosoft ATR42 with severals stutters and a freeware Short 360 which sounds are to the ATR 42 folderThe ATR 42 is a FS2002 plane patched for FS9 and it does work very badly. Once I suspected FSSOUND.DLL I downloaded the beta 2004 version of that DLL, but with the same issues. Who is able to give a rational explaination??RegardsRoger

Hi roger,I have a similar issue with some A/C, though I'm not sure FSSOUND is the culprit. I have Stellan Hilmerbys DC9 package which uses this module and it flies as smooth as silk.I *think* that mostly these stutters stem from I/O activities on the HDD. In my case it helped a lot to set a fixed size swap file (~800MB for my 512MB RAM). I believe I have are less stutters since.Obviously it might not work for you but IMO its worth a shot.//Mike

Hello Roger,Well, sounds like it must be something, but what I cannot be certain. I tried the Beta version of the FSSound.dll and found it worked just the same as the old version. Except, there were problems using it with some aircrafts. So, I went back to using the old version and have had no problems that I have noticed with any aircraft. To me, you have already pointed out that you perhaps suspect that it might be something to do with the sound for this aircraft. There are a number of thngs that are just plain quirky sometimes. I have a tweak entered into my FS9.cfg file that gives me sound on 4 speakers instead of just the normal 2 on my 5.1 Speaker system and sound card. But there is a freeware aircraft, the Gulfstream 100 House 2004 by Mario Coelho, which I like. But for some reason whenever I use this aircraft my sound instantly reverts to a 2/2.1 speaker setup. After I have finished flying this aircraft I have to go and change my speaker settings back to a 5.1 setup from the 2/2.1 that it reverted to caused by using this aircraft. This is the only aircraft that I have flown that I have seen cause this to happen.One other possibility that could be going on here is a problem with one of the gauges used in the panel. Sometimes installing aircafts, whether they be freeware, payware, Setup.exe's, or Zip files is that they contain an older version of gauge(s), effects files, or sounds, ect. SO I try to be careful when installing stuff. Most of the time I do not install Setup.exe's directly to my FS2004 folder. I will point it to a temp folder and let it install to the temp folder first. Then copy everything over to their proper folders in FS2004 manually. When I do that and it says such and such file already exists I look at the date and size of the new file and the already existing file. If the new file has a newer date then I will usually say yes to overwrite, but not always. Sometimes I know that it is just exactly the same file even though it has a newer date and so I will not bother letting it overwrite what I already have. Same when I unzip a zip file. I will go ahead and unzip directly to my FS2004 folder, but I will look carefully at the size and date of the files that I am prompted about overwriting and only allow newer and updated gauges contained in the zip to overwrite an already existing file. Also, usually when I get to some point of having quite a few aircrafts installed with them all working good and everything, I will use WinZip to make a new zip file that I archive my entire FS2004 'Gauges' folder into. Then if there is a problem with some new gauge I installed, where I overwrote one that was working just fine, I can put the older one that was working back by opening up the archive I made and unzipping that particular gauge to my Gauges folder.I hope you catch my drift here. It could be some sound, gauge, effect file, or something else altogether that is not getting along with this aircraft. And, take care when installing stuff into FS2004.Regards,Jim

I have gotten very usefull infos.Thanks.Roger