It is a professional parametric equalizer but uses graphic-style sliders for boost/cut. It has 8 bands with fully controllable Q for each band (which you can tune) to totally zero in on a frequency you need to remove or boost. It has sweepable frequencies in each band with highpass/lowpass filters.
How do you use it? Like how you would use any a parametric EQ. If for example you have an offending frequency, boost any frequency near it and tune the parametric EQ until you find it sticking out. Then, cut.
FWIW