With UBS connected, HX Stomp picking up all kinds of PC noise. in Helix Posted 39 minutes ago Doesn't matter what ADAC is suffering the interference, doesn't tell anything about the quality of such ADAC or device which is using it. As I explained above, electromagnetic interferences (and/or ground loop noises) are NOT being carried as an audio signal from PC to HX, not sure why you keep mixing the audio interface thing with the noise aspect. It's like water spilling into a piece of paper, which is not making paper and water the same element. The carrier is the USB cable as a electric wire (not audio signal), and the fact there is grounding being shared. Again and again, the noise you are hearing IS NOT BEING sent as audio signal. You can potentially get that same noise in any device being used in that same environment. You can get terrible ground loops and EMIs even with 40K$ broadcast level audio equipment.