Sweepable mids from 180Hz-1kHz If you follow the description and settings explained in that link it describes how you can shift the mid freq to have a really useful impact on the tone.
"....At this point, if you want more depth, rather than boosting the bass, you move the mid frequency knob clockwise, which pools out upper mids and articulation. If you want more of that, then you move the knob counter clockwise to bring those upper mids back into the tone. The highs and lows stay the same, so it's an easy way to adjust your tone on the gig to get more/less articulation in the mix."