Doppler effect

[OPS1 1]

Iam refering to when your sat on an airliner. If youre sat infront of the engines you can hear the engine sounds, like spool up and the buzz saw sound. If your nehind the engines all you hear is the BOOM from the exhaust pressure. The same effect is also on the exterior oustide of the aircraft, like a doppler effect. I know in FSX some sound developers have created this, but can you use this effect in FS2004?