weird sound bug at swank level...need help!

[L_S_L_S]

hi people,
when i start level swank my sound begins to make strange noises etc, other missions there weren't any problems at all. i changed my soundsetting but no diverens. Plz help!

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P4 2.66
768 mbram
gforce 4 ti 4200

[L_S_L_S]

hi people,
when i start level swank my sound begins to make strange noises etc, other missions there weren't any problems at all. i changed my soundsetting but no diverens. Plz help!

-----------------------------
P4 2.66
768 mbram
gforce 4 ti 4200