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sounds like it could be dust or moisture ...Try cleaning the board and knobs and faders. this may help it may make it worse. Also while at it...check all connections...especially from board to amps. or to outboard gear. Could be a bad chord
The problem is that card has only UNBALANCED inputs. You really need balanced or first run the mixer outputs through a DI backwards. Frankly, I would recommend NOT using a card within the PC as there is so much digital noise. Use either a USB or Firewire external convertor and for goodness sakes use balanced lines from teh Mackie... ALL interconnected equipment needs to be powered from the same receptacle or source. M Audio, Roland/Cakewalk and Presonus all make cards as do others.
The internal audio systems in the PC's are inadequate for high quality work. You should get an external audio system that attaches via firewire or USB to your MAC. Then use balanced cables from the mixer to this audio interface. There are MANY different audio interfaces... Search the music equipment suppliers in the "recording" section of their catalog...
This sounds like a ground loop. Make sure ALL (including the computer) interconnected devices are powered from the same receptacle. Make sure there are no lamp dimmers around as these can cause hum...
Use TRS to TRS balanced cables from the M Audio to the line in 11 and 12.
Set the pan controls for the 11 and 12 to opposite directions to split the stereo to left and right main outputs. (otherwise both main outs mix the left and right and you get mono result.
Hi kielhunt
It sounds like power supply issues.
You may have bad capacitors and/or bad regulators.
If you have a multimeter you can get in there and check the dc voltages for ripple(ac voltage mixed with dc) or over/under voltages along the +/- 15volts lines.
Good luck
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