[header] How to use a parametric equalizer [title] 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 low-pass button will generally cut any frequencies above around 10khz. Many live mixing boards have a high-pass button which serves the same purpose as the software version.