Designed for heavy drummers who don't keep their hi-hats open.
The Coady Compressor is an accessory that gives drummers the ability to keep their hi-hats in the same, semi-open position every time they step off the pedal. In conjunction with a wash control, which enables you to set the desired amount of cymbal wash or sizzle, the top hat sits on the top portion of the wash control and the Coady Compressor connects to the pull rod only.
So, a wide open hi-hat is never, truly wide open - it always has a trashy sound. It's like having an x-hat that you can choke off at any time by stepping on the pedal.