If the player character has no line-of-sight with another unit who's firing his weapon, you will not hear the gunfire. Only the bullet-cracks are still audible.
This has been especially notable during Tanoa gameplay with AI units frequently behind trees, making it very difficult to locate incoming fire.
Issue present in 32-bit & 64-bit client.
Audio sources set to 128
Observed: When the player has line-of-sigh with the shooter, the gun can be heard. If line-of-sight is broken (from a first-person perspective), only the bullet-cracks are heard.
Expected: Gunfire should still be audible from a close distance.
Line-of-sight is from 1st person perspective. Using 3rd person, line-of-sight with the shooter is still possible for the sound-issue to appear.
Bug can be seen in the following video:
https://www.youtube.com/watch?v=-b2BTKme5CY
This issue is no longer reproducible with the latest version 1.84 and should be closed