Sound problem with Israel mk2 theatre.. Help!

[frehley 0]

Hello guys, I have the Israel mk2 installed in f4AF but every time I start a mission or a created mission, when the mission starts I don't have the sound engine outside the aircraft everytime I put the "outside view", the sound engine inside the cockpit works fine, but I don't know if there's a fix for this!!!!! If someone can help me please!!!!!!!thnxs!!