Hello there!
I am experiencing a weird sound problem that only occurs when the "zombies" resource is running.
When it is running, the acceleration sounds of cars do not work anymore and are played back like you would be riding shotgun in MP - it is only a straight pitched sound, you can't hear the gear shifting anymore, regardless of speed. You can reproduce this by disabling the zombies resource and get into a car and accelerate. Now enable the zombies resource and get out of the car and inside it again and accelerate again. You will hear no pitching up and no gear changes, just a steady frequency.
Also, the resource makes several aircraft in the game have no sound at all. For example the Hydra keeps its sounds, but the Sparrows and other Aircraft types are muted.
Are there any workarounds for this? I think it has something to do with the zombie groan sounds.