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Old 03-25-2020, 08:56 PM   #5
Philbo King
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Since it seems to affect the highs specifically, there is a fair chance you are running into aliasing in plugins. One solution is to change the project sample rate to 48k or even 88.2k.

Aside from this, intermod distortion can be caused by any nonlinear processing that is fed more than 1 frequency at a time. compressors, limiters, saturators, clippers, even clipped samples.

Start by putting a spectrum analyzer on the master track. Solo each track, one at a time, and look for audio frequencies that aren't a multiple of the fundamental note. Those are the culprits. If these only show up when 2 or more tracks are soloed, it is caused by intermod distortion.
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