My converter and i/o is the Mbox Pro (3rd generation in case it matters) It uses the preamp if it's switched to Mic. It does not apply the preamp section with line inputs. I have a set of Roland TD-11's that have a line out, L/R. When I first set them up I got almost no volume at all. With everything cranked, it was barely even audible. The kind people here helped me figure out that it was the fact that I was using stereo cables instead of mono. I didn't know it mattered going from S > M, but I switched out the cables for mono, and the volume problem was gone. So, it's mostly gone. If I plug the drums in the rear (this post is just full of double entendres) it's line level, no preamp. There is a sensitivity switch in the back of -10db or +4db (iirc) which is set to +4 and the drums are fairly quiet. With the brain showing 5 bars of output (clipping) PT maxes out at 3 bars. I have to crank the track the whole way to get the right volume. So one question I have is, if I turn down the volume from the brain so it's not sending clipped signal (the brain of the TD-11 has a volume knob that controls headphone out and line out) but kept the PT track at +12db, is there anything inherently wrong with that? My second question is about the mic section. If I move the drums to the front side of the Mbox, it's mic level (is there a better term for that?) input so it runs through the preamp section of the Mbox. When I connect them this way , I can turn the volume up, and THEN, I don't have to crank the PT track. Is there anything "wrong" with doing it that way? This is what I would think is ideal; turn the volume on the drums down so it's nowhere near clipping. Run them through the preamp section and amplify the signal from the Mbox, bc it's probably the best piece of equipment I have. But I'm not sure if there is something I'm not thinking about/aware of, e.g. am I going to cause a failure by running the drums through the preamp section. I would think it doesn't matter so long as the signal isn't too hot, which it obviously isn't.