PCS:Odd popping or crackling noises
Hearing odd popping or crackling noises during gameplay
Causes and Solutions
Cause 1 - No HAA
This problem can be cause by a lack of hardware acceleration (HAA) support.
Solution #1: Turn down hardware acceleration for sound in the Sound tab of the Dxdiag menus.
Solution #2: Turn off hardware acceleration in the Oblivion.ini by setting
bDSoundHWAcceleration to 0.