Buzzing sound

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Hi!

I'am building a 5 channel gainclone-style poweramplifier.
Preamplifier is a M-audio Revolution 7.1 PC soundcard.
First I tried this card in my Shuttle Barebone PC -> the sound was horrible.
Now I'am using my old PII 266MHz Intel motherboard PC -> it sounds great. But, I can hear an annoying buzzing sound in the background, the sound pitch changes with soundcard sample rate.
What is it!?
 
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