I have the following singal chain that I'm trying to set up properly for practice playback so I can perform and run tracks simultaneously: Electric guitar > Helix LT > Focusrite audio interface (linked to PC) > headphones or studio monitor. My audio interface works fine when I run tracks through it from my pc but when I switch on the LT I get zero signal when I touch the guitar except for occasional earsplitting singal overload sounds that seem to come when I literally touched nothing. I have no idea what to do at this point. I've checked the i/o quarter inch cables and they work just fine. I'm convinced something is wrong with the LT. Actually I know its the LT because when I hook it up to direct amp it still doesn't create sound. Current firmware is 3.11.0. And yes I have performed a factory reset.