Hi, I am trying to run my 6505 head into the Stomp FX loop by using the send and return. The head of course is running on line level with a load as it is fully cranked. So I am not using the fx loop of my amp!  I am connecting the amp like a distortion pedal. I am devastated because it creates a feedback loop. Is it a fact that heads cannot be run with the Helix or is there a solution? I really want to use some effects before the overdrive section but I never tried this with a multi effects