Anyone having a problem with interface outputs and extreme 60hz noise when trying to reamp? I've deducted it's not the amp, the TS, or the cables. The noise only comes when I try to plug into either my Saffire 14, 40, or even 56. I plugged into my guitar as well, dead silent. Just when I plug into the interface. It makes noise even if the unit isn't plugged in. Once I plug it into the unit, noise rape. Any advice?