I've already sent my KPA in for repair for this issue once before and they replaced my DSP board and said everything thing should be fine. Unfortunately, it's not. On my high gain patches, I get a horrible buzzing, crackling noise. I thought it was related to the electricity in my house but I took it to my dad's house and it was making the same sound. Here is an example clip to show you what I'm talking about: Clip
The first section is with everything plugged in as normal. The signal chain is KPA -> Presonus Inspire 1394 -> PC
The second section is with the KPA plugged into a Furman PL-8C and everything else plugged into the usual power strip.
The third section is with the entire signal chain plugged into the Furman PL-8C.
The fourth section is everything plugged in as normal, but in the middle of it, I raise the noise gate from 3.0 to 6.5. It helps the ringing out of the noise, but the buzzing is still coloring the guitar tone.
I used palm muted chugs because they most prominently display the crackling noise, but it also happens when playing normally. It's frustrating because I paid so much money for this machine I can't even enjoy playing because this noise drives me crazy. Can anyone offer me any insight?