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is your laptop plugged into a soundcard. or directly from laptop to the board,? i used to have mine plugged into a soundcard and a hum elliminator (ebtech), i still get the buzzing sound, i just went to radio shack, and bought myself a ground loop elliminator for $16.00 and plugged my laptop into that and to my mixing board and the buzzing went away, dont even used my soundcard anymore
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