All sounds in FSX have reduced in volume by about 80%. I don't know why for sure but it may be some free ware aircraft I added as it happened just after. I've looked in the main sound folder in FSX and I assumed I would find a "sound dll" in with all the wav files but no "sound dll" in there. Any advice will be appreciated.

Go into "Control Panel",click on "Hardware and Sound",and then click on "Adjust system sound"...With FSX running,there will be a window showing the volume "slider" that you can adjust....Hope this helps,as it has happened to me also...Lou

Thanks Lou, yes that's the first thing I checked when it happened, also the volume sliders in FSX. So far I've not resolved the problem, un-installed what I thought was the offending aircraft with its sound files did nothing.All other sound volumes are fine on my system. I cant just increase the overall volume as at high levels the hard drive etc can be heard through the speakers. I will really appreciate some help with this problem.

Any more suggestions on this problem?

What is Your Sound Card? Some Xonar's Have Smart Volume which reduces some sounds (you can check this in its control panel)

I had the same problem. For me the fix was go to control panel,sounds,communications and make sure the do nothing box is checked. Hope this helps. keith

Still not fixed this problem. below are my sound settings in the fsx.cfg, maybe someone can see if they need changing.Thanks Keith, that was one of the first things I checked.[sOUND]AmbientUIMusicVolume=-6.000000SOUND=1SOUND_QUALITY=2SOUND_LOD=0UISound=1AmbientUI=1PrimaryDevice={DEF00000-9C6D-47ED-AAF1-4DDA8F2B5C03}VoiceDevice={DEF00002-9C6D-47ED-AAF1-4DDA8F2B5C03}SOUND_FADER1=1.000000SOUND_FADER2=1.000000SOUND_FADER3=0.380000SOUND_FADER4=-0.000000AmbientUIMusic=FSX01

Still not fixed this problem. below are my sound settings in the fsx.cfg, maybe someone can see if they need changing.Thanks Keith, that was one of the first things I checked.[sOUND]AmbientUIMusicVolume=-6.000000SOUND=1SOUND_QUALITY=2SOUND_LOD=0UISound=1AmbientUI=1PrimaryDevice={DEF00000-9C6D-47ED-AAF1-4DDA8F2B5C03}VoiceDevice={DEF00002-9C6D-47ED-AAF1-4DDA8F2B5C03}SOUND_FADER1=1.000000SOUND_FADER2=1.000000SOUND_FADER3=0.380000SOUND_FADER4=-0.000000AmbientUIMusic=FSX01

Try this Ray[sOUND]AmbientUIMusicVolume=-6.000000PrimaryDevice={16C80F36-450A-4C87-9DAF-612045C81111}<<<<Replace with yoursVoiceDevice={DEF00002-9C6D-47ED-AAF1-4DDA8F2B5C03}<<<<Replace with yoursSOUND=1SOUND_QUALITY=2SOUND_LOD=1UISound=1AmbientUI=0SOUND_FADER1=0.500000SOUND_FADER2=0.500000SOUND_FADER3=0.500000SOUND_FADER4=-0.500000AmbientUIMusic=FSX01

Thanks Julian, that's exactly what I was looking for, problem solved.

That's great Ray.

Don't forget this important line ;)SOUND_WIFE=0