My shot on an attempt to imitate vehicle engine revving noises. Coded in AS3, but should be able to achieve the same result with AS2.

Let me know what you think. I'm not sure if this is the best way to imitate engine noises.

Flash CS3 FLA can be download from http://www.uf3k.com/v7/Game-Virtual+Re v+%28Open+Source%29-14.html