Give it a shot alright
Just something that dawned on me having owned a Numark I/O soundcard before, there was a driver bug with Mountain Lion where it would only work correctly if the soundcard was plugged in
before the unit was powered on -- plugging in the soundcard afterwards resulted in a "Bitcrusher" distortion on the outputs.
It would be worth checking to see if a reboot with the 4Trak plugged in first fixes the problem. I Wonder if an OSX update broke something or replaced some driver essentials which might need replacing.
I still would not be comfortable playing out with a non-100% working controller regardless though - if one thing has broken what might break next halfway through a gig
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