It's not just against sound causing stutters but also against sound distortions

Have a look here (guru3d)

Windows: Line-Based vs. Message Signaled-Based Interrupts. MSI tool

and here (RME)

The answer to latency pops and clicks, improve latencies M.S.I.

It worked for me!

Great tip, worked a treat for me as well.

I used the MSI tool which made it very easy, just click and apply.

I have and old system with a PCI soundcard (a good one though) and my Nvidia gfx card shared the same linebased IRQ as my soundcard.

The soundcard was linebased only, but the gfxcard could be set to msi, so I changed that and voila, no more rumble and pops despite fps going over 100.

Then I noticed the soundcard still shared IRQ with some chipset thing, so I put the soundcard in another PCI slot and now there are now more shared IRQs what so ever.

This part of the system should now be running optimally.

Cheers mate!

Edited April 13, 20215 yr by neumanix

Well, it didn't fix the sound distortion >100 fps after all, as I stated in the post above.

But it was still nice to get the IRQ channels optimized a little.

FS9 does not support unlimited framerate.
If the framerate exceeds 60fps the sound stutters and distorts.
To fix the problem, use the limiter at maximum 60 fps.

On 4/15/2021 at 1:05 PM, efis007 said:

FS9 does not support unlimited framerate.
If the framerate exceeds 60fps the sound stutters and distorts.
To fix the problem, use the limiter at maximum 60 fps.

Not true. The fps limit for sound distortion is at 100, for whatever reason. It seems to be the wind sounds that distort. You can test this by unlocking the frames in a situation where you get >100fps and enable/disable environment sound in the sound settings.

As a TrackIR user I prefer >100fps, so a way around this distorted sound is to edit your aircrafts sound.cfg and exchange the wind sound files for silent ones. There is already one in FS9/sound called silence.wav.

Also the general default wind sounds in FS9/sound need to be replaced with silent .wav files.

This way you get rid of the distortions but keep other environment sounds, such as AI traffic etc.

Edited April 16, 20215 yr by neumanix