Just picked up a Morley Ebtech line level shifter and after many reviews on this forum I was getting a bit scepticle. I get the best tone with my modules master around 1:00 to 2:00 and obviously this clipped the hell out of the fx loop on my RM100. Happy to say the line level shifter did it's job and the fx sound wonderful with no clipping. I mainly use TC, Keeley, Electro Harmonics, Budda, 70's MXR and 80's Boss and DOD fx and they all sound great. I've heard that some of these units are wired in reverse but mine is correct and definitely solved my issue. I know some people can't get them to work and all I can say is it works great for me. I'll never know why these amps weren't designed with a level control to adjust the loop for each individuals needs, or many of the great amps today for that matter.