I was trying out Kurt's suggestions about re-amping the guitar tracks to create layer of heavy sounding guitars. I threw a cables from the headphone output of my aadrvark q10 straight into the clean channel of my mesa boogie dual rectifier head. I hear the guitar allright but I aslo hear a pretty loud "hum" sound. I tried using the main outs from the Aardvar but same story. I even re routed the signal into my mackie 24:8 mixer and tried all of the mackies output but still,I get a loud hum. Is this normal ?? Any suggestions ??