Help with sounds for aircraft mod

[Joeh 1]

Ok i have made an aircraft mod, and im having some trouble getting it to make any sound, so im hoping somebody can help me out with a few things.

-What length should the sound file be (in seconds)

- What file format should the sound file be

-Where do i place the sound file in the mod pack (what folder ect)

- Finally where and what do i put in the Config.cpp

at the moment im just trying to get a basic propeller sound into the game called idle.wav, ive converted this into a .wss file and placed it in my p:\mod pack folder, then in the config ive tried lines such as

soundEngine[] = {"\MY_Vehicles\idle.wss", db10, 0.7};

but i just cant get it to make noise, note, im 100% a complete beginner so id ask you keep it in mind if you help me :), thanks very much.

[Joeh 1]

ok ive fixed that and ive got 4 sounds, 2 for inside the cockpit and 2 outside at high and low speed, i have a recording of a flyby that this plane makes, is it even possible to use this flyby sound ive got in the game so that people on the ground hear this?