Hi sorry for the late reply. Thank you, in case of F-18 sound it was just a basic tweak to show how easy would be to simulate such a vortexes (I already extracted such a sound and you'll find it in the new much anticipated F-16). The problem with the loops it our psychoacoustics. Humans can indentify very well any loops, our memory is really remarkable. default audio X-Plane architecture supports WAV files, mono&stereo. But we shouldn't concentrate on the old technology. Look for the DreamEngine. I'm cooperating with Conex. It's still in the works but we'll have many advanced tools on it, even ambisonia... It's good to be in touch, regards arti