All background sound is sped up.
Go to start, run and type DXdiag.
Click on the sound tab
in the directx features area of the screen turn directsound hardware acceleration down to none
Go to start, programs, Mafia and run setup
Now go to start, programs, Mafia, Setup. Change the sound to stereo speakers and make sure the "Disable EAX" and "Software mixing only" buttons are pressed in.