I use an LMK with my Roscoe, on which I boost the active controls quite high. I have both channels on at once and my volumes are set at approx number 2, inc the master. The blue light comes on occasionally, but I ignore it, as there's masses of headroom. However, if it's on all the time, there could be a problem, but it's doubtful.
If you're concerned I have an email address for one of their customer service guys. Very helpful.