Incorrect reproduction of sounds or there are no sounds of machine guns and automatic machines. It as that depends on the player's position, but the sound almost always has not a full track.
It is reproduced on the most part of weapon and stationary weapon. The system of distribution and reproduction of sounds of weapon is broken. At a short distance it sounds as though it is very far. Barriers and obstacles, lack of direct visibility of the shooter, can't change a sound so. At distance of 10 meters, the sound changes and strongly depends on the direction of a shot. In the firing line there is no shot sound volume.
All footage of the video from the NATO demonstration mission.
https://youtu.be/u6PpsSZ515I
https://youtu.be/dtLrmovp0gU
https://youtu.be/K9oOOtEraME
It very badly influences a game. Sometimes the shot isn't even heard. It is heard as bullets get nearby, you is wounded, but you can't be guided from where shoot at you. It disorients you, the sound doesn't allow to estimate distance and the direction.
It in release 1.68, in DEV 1.71.0.141445.

The sound equally is reproduced in scenes, on any sound PCI and USB device, the stereo or 7.1, 5.1 sound doesn't depend on settings.