friedus

Hello, first of all, please don`t mind my English. No native Speaker! I want to record my EWI Usb with the Edirol UA 25 plugged in the Aux Input of the Spider Jam (or other Inputs doesn`t makes a difference). But no matter which output I take (The jacks or the cinch or the Phone output) there ist always a strong humming. And when I play the Loop the humming ist on the recorded file. Anyone an ides what to do? Greetings Friedus