I have a problem in that if my weather is set to anything other than clear skies, the sounds will never work, no matter how much you reset the aircraft.  If the weather is clear skies, it will work, and then if I switch it to any other weather besides clear, then the sounds go away.  Captain Sim tech support has been less than helpful with this.  At first I thought it was only when I selected REX weather, however I discovered it is any weather.  So what fun is flying this bird if I can only do it in the clear sunny skies, or a clear night?? >:(