Here's my problem. I want to hook my guitar up to the front input on the Axe FX and I've got my computer out to the rear input on the Axe as I use it for an effects processor for Ableton as well. The problem is that when I switch to the front input on the I/O menu on the Axe, there's no sound unless I unplug the rear inputs. Anyone had this problem or know of a solution?