Is everyone in here on a 3 week coffee break?
This is what you need to do to fix your sound problem:
1. Run "CMD" (command prompt - start > run > enter cmd)
2. Get to the Freight Tycoon directory
3. type "tycoon.exe -s" and press enter
4. Choose Directsound as sound source and enter the game.
5. Problem solved
If you dont know how to do this, simply reinstall the game and remember to put Directsound as sound source as the game cant pick one for you automatically.