Since Vista came out, 5.1 playback was problematic. So, if the sound is distorted, when playing such a file, open AC3Filter dialog window (rightclick -> options -> filters -> AC3Filter and go to GAINS TAB. In here you should see the input and output levels. If the output level it's at the roof, the this ia the cause for the distortions and you should reduce volume from the main slider (be sure AGC it's not enabled).
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