I have been wanting to add a Keeley pedal to my chain and I am already thinking of modding my DS-1 and Ibanez TS9 by Keeley. I have heard alot of good things about their Compressor pedal, but really I dont know what it would really do to my sound. I have watched a few demos on Youtube and really wasnt able to pick up a difference. So what I am really asking is are the compressor pedals worth the talk everybody says? If so what does it do to your sound? AND there are two Keeley Compressor pedals, would I get the original or the four knob version. Thanks for your help.