I am OCD with the treble on my presets, and I always wish there was more to fiddle with. And walla ... the bright knob takes care of that area in the tone that always perplexed me. It really works well, and does not change the overall feel ... at least on my Marshall based presets. Awesome addition. Crank that Super up, kill a bit of the brightness ... fan-tastic tone. What you WISH your cranked Super sounded like. Great stuff FAS ...