... and for the "ChiLLi" answer, "Why would you want to?" Actually, that was not an answer....
I have done some of the footwork necessary to make a FMod sound profile. It is quite a bit more complex and 100% more capable of recreating "realistic" sounds. For instance, your plane engine doesn't just increase and decrease in tempo, it adds characteristics of exhaust as well as other fine details, and as for custom sounds, the potential of adding propeller noise, engine sputters, and any number of imaginative elements can be created. All of that, and according to the boss, the sound profile uses less available game memory (or something to that affect
).
For those like Challenge, Mitsu, USRanger and TwinBoom, the work they have done for AH2 has been amazing. I can only imagine what "mind blowing" future sound profiles will be created by them. The comparison of running a race with a vintage Maserati, and then running that same race with present day Formula I car.