I tried your file and there was no noise. I normalized it and there is a faint crackle but it would be hidden in a mix. switch off the pc that is causing the problem and play your own mp3 on one of the others. do you get the noise?

even if the Scarlett is switched off is it still connected to the problem pc with a lead?

how close are the other pcs to the problem one? could a faulty lead be broadcasting rf? that's a guess but the only thing i can think of. are there any other peripherals connected to the new pc? try new leads and try switching off other peripherals like the monitor (is it a new one?)

Last edited by Bob Calver; 01/16/21 02:04 AM.