T-bal made a comment in another thread about "flitting" or distortion in the lower register of the bass using the full circle. I get this "flitting" at higher volumes also, usually just on the lowest 3 or 4 notes. It seems to be coming from the pickup signal, which is carrying most of the low end (not the mic). I have been chasing a similar issue with my rig. At first I thought my iAmp was clipping (it may be) and then I thought my speakers were the culprit, I replace the midbass and tweeter in the cabinet. Still there. Its seems to occur only at pretty high volumes (like I usually play) and only below G on the E string. Is it possible that the Full Circle is clipping? I've never heard of a piezo clipping.