Missing sounds from vehicles and other things


Modding patch tester
Hello there! I'm really in need for some help since i'm having a big problem where any vehicle I enter has no engine sound and I can only hear the horn when the vehicle is not moving. Moreover the gun from the alien mini hovercraft has intermitted sound and some missions have no audio in certain parts.
Superpowers and guns sounds seem to be working fine.

I searched online and people mentioned that I should watch the 2 intro at the start of the game but that didn't fix the problem for me :\ . Any help is appreciated, thanks :)
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