Aslain,
There maybe a problem with the War Mod engine and gun sounds. I played 3 tanks, 2 TDs, 1 LT and there was basically no engine sounds at all. They were very low and sounded close to the default sounds. The gun sounds were hit and miss. Sometimes I could tell and sometimes not with the mod.
I removed it and then downloaded the full War Mod and installed it. Made a big difference. Different engine and gun sounds.
SailorBoy