I have a new Kemper without the power amp option. I have the Main Outs set to mono. When I go out of the Main Out Left or Right 1/4" jack into my DXR10 all sounds good with minimal noise. When I switch the jack to Monitor Out there is some loud hiss & minor static. The output levels are set the same for the Main Outs & Monitor Out. What could be causing the noise? Has anyone else had this problem?