Sound for helicopters
 

There's a way to have the propellers sound for Helicopters(KA19 used for mission "Four Horseman" ) in DF2?
Because when I play campaign missions, Helicopters can be heard when they fly and on custom mission it's like they fly without noise...Why?
Pls help me... Im doing a mission with a Helicopters assault at the start of mission and I need the propellers noises:hail::hail::hail:

Perhaps some files are missing and still inside the PFF or PWF...?

I don't know much about DF2 but Campaign missions are linked so that could be an issue.

Is it an extracted and modified mission?

In that case maybe you'll need to pack your mission to get it to work.