I start the game ... single player or multiplayer ... in game when I accelerate , steer left , steer right or brake there's a little "BEEP" everytime I press the button's ... when I press SHIFT + N (sound off) that "BEEP" dissapear with all the sounds in the game and when I activate the sound that "BEEP" comes again ... can someone help me to solve the problem ?!

Hmm. I hear beep voices as well. when i throttle i hear moskito group beeps :E

edit: Btw. we cannot help you, if you wont give your comp details+os and so on.

Strange. Do you get these symptoms with any other "games" or audio software?
If you've not got the latest directX, you may wish to upgrade that (http://www.microsoft.com/downl ... D92A3&displaylang=en), or perhaps your sound card drivers.

Have you tried the test patch at all? (http://www.lfsforum.net/showthread.php?t=9472)