cannot hear my orders when inside vehicle [solved]

[cleggy 297]

I am working on two car_F class vehicle addons. 

 

if I start a scenerio sitting in either vehicle
and order my crew/cargo to get in or get out I can't hear the order being given
or the reponse from my group. 

the order is carried out, I just don't hear anything.

Issue the order from outside the vehicle and all is fine.

My WheeledAPC_F class vehicles do not have this problem.

 

Any idea why this is (or in this case is not) happening?

[cleggy 297]

found the problem. the unit I was using as a crew member is faulty.