Hello i am a line6 customer from Pakistan. I have recently begun hearing a crackling noise whenever i connect my guitar to the instrument inputs. I have tried changing the buffer size to make sure if it had something to do with processing speed. The dials on the ux2 dont move which seem to indicate that there is no noise flowing in (i also changed guitar cables and instruments to make sure if there was a fault in the instrument hardware). I also replaced the usb cable which could potentially introduce noise. It has been a frustrating couple of months. Please help