When ever I move the hat switch the sound changes both in the NGX and the MD11. It sounds best when I am looking at the NAV/RADIO stack. When I release the parking brake the sound is somewhat muffled. If I move the hat switch to the left the sound increases in my left ear. Is this an FSX issue? ThanksDon

not an issue - it's by design. You are turning your head so the sound is different. Switch to an outside viwe - the sound changes again - now rotate the view around the a/c - the sound changes depending on your position. All normal. Vic