The freeze is an amazing piece of gear, and I really like the look of it too. You simply freeze whatever sound comes through it at the moment you press the pedal. So if you play a note, that note will be sustained indefinately letting your play over it. I personally use it with an acoustic instrument, as a sort of drone machine to play melodies over, and here it unfortunately reveals its big flaw - the pedal button makes a VERY LOUD klick noise when pressed. In an acoustic, low volume setting, it is very noticeable. I started getting into thoughts about modding my Freeze with a softer button when I learned that EHX has another pedal called Superego which is like a Freeze pedal on steroids - the same possibilities but with added glissando and other modes - and it has a silent button. So I got that one instead. Until ehx fix a silent button the freeze is unusable for me, but its a bit sad because the freeze is an awesome little pedal that looks cooler (heh) then the superego.