...headphones (although better ones with a decent LF response will reveal the hum better, of course). The problem is almost certainly due to poor power rail decoupling/isolation within the unit. I ...
...headphones, turn up to a high level) and listen again. is the noise white (hiss) or hum (low freqency) if you have no noise, you have a good mixer and that is what it should be. No plug in your first ...
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