How to use a parametric equalizer<br>Use the hi-pass and low-pass filter. [substeps] On many software programs, there is a high-pass and a low-pass function. The high-pass button will generally cut any frequencies below 100hz and sometimes 80hz.
The high-pass button will generally cut most frequencies. 
The high-pass button will cut some frequencies but not most as it is limited in scope. I don't think the system knows the scope of the frequencies. 