And that's not all. Strange things happens when I play the KPA at home. When using headphones and cutting all the bass and boosting all the highs the KPA sounds shrill and sterile and lifeless. That must be a bug. You can only hear it with your eyes closed, the low E string dropped 12 tones and then play the E string at 21 position. Now listen really carefully and you know what I mean. For the people who say they can't hear it open the window and lock the door. If you still can't hear it sent the KPA back and replace it with the black version (or the grey one if you already have the black version).
But seriously, I don't hear the artifacts some people are talking about and the noisegate works fine with me. I believe that all these things (or similar ones) can be heared with a tube amp at high gain settings.