I am considering buying either a Boss EQ20 10 Band Graphic Equalizer or TWO Boss GEB7s. Two questions: 1. If i went with 2 geb7s would having two pedals vs one create more signal loss or noise? 2. I find the EQ20 more attractive in that it has 10 rather 7 bands of sliders. However, how useful are the extra 3 sliders? The lowest goes to 31.2hz. Is that even audible?