Von der UBISOFT FAQ Seite

"On some systems, there is a noticeable loss of performance tied with the particular execution of sound in DirectX. If you noticed that in-game sounds begin to sound distorted or intermittent, try lowering the Hardware Sound Acceleration, found in the DirectX Settings. To do this, you need to find and run the file C:\WINDOWS\system32\dxdiag.exe, choose the Sound tab, and lower the “Hardware Sound Acceleration Level� slider a step to the left. If the sound anomalies remain, you need to move the slider further left, or turn it off completely"

Soll heißen: Starte "dxdiag.exe" , wähle "Sound" und schalte die Hardware-Beschleunigung aus.

Hier der Link:

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