bug: missing some sound effects

[6r0m]

in the game, I can't hear some sound effects like a shot, but can hear the sound of a falling shell.

Before I didn't hear any sound in game (except small short trailer in the game beginning), and I put in the Engine.ini :
[Audio]
AudioDeviceModuleName=AudioMixerXAudio2

now I can hear music and sound without some effects.

maybe are there another settings that I could tweak?