When shooting from inside the Taru or the Huron, the sound of the shot is "suppressed", if I may say so. Not quite sure of how to describe it. It is not loud enough? It sounds like somebody else fires from inside a nearby building.
This issue is only happening when shootinf in 1st person. Shooting from inside any of the new choppers in 3rd Person will make a clear, normal sound.
1 - Get in the editor
2 - Create a Mi-290 Taru
3 - Create a soldier (player)
4 - Preview
5 - Get in the Taru in right (or left) passenger seat
6 - Shoot from it.
7 - Notice the sound is strange
8 - Switch to 3rd Person
9 - Shoot from it
10 - Notice the difference
11 - Repeat with the Huron
I am not using any mods.
The fired shots inside the chopper should be much louder than fired shots outside.
I don't think, the developers try to simulate ear plugs or a headset, that suppresses external sounds.