I have a Zoom MS100bt that I run after HPF pre then into my PJB FlightCase 150. Today we were at an outdoor gig with my DB and I was only hearing the lows and it was feeling like it was going to feedback. I use a MSP body piezo mic. First I tried rolling down the HPF, but that didn't fix it. I had a six band EQ and Avalon U5 pre amp programmed into the Zoom. We were already playing and I didn't have time to mess with the EQ so I killed it but that didn't fix the problem. The Avalon sim has the 6 tone curve knob. What a life saver it is. Between tunes, I tried a couple different positions and found the one that cut through the mix. We then had to lug our gear into a gym and I rotated the knob and boom I was sounding good. Man I know the Zoom is a cheap imitation to the real thing. I can see why it is so handy in the studio. Makes me wish for the real thing someday.