A question about sound file editing.

[cnyle]

I have been messing with some sounds to add to the dirt late model mod from Bullring. Is there a .txt file inside the sound.dat to tell the sim which sound to play at any given point in the game. The problem I am having is getting the engine sounds to come up smoothly. I have it sounding pretty good, except for just off idle to about 2000 or so rpm. Also, if there is a said file inside of the sound.dat, would anyone have a copy I could get. I really hate to unpack the entire file and have a ton of other .wav files everywhere. Thanks.