Hey there!
Who knows what guitar effect pedals jim and carl are using on stage??
I think one of them is using a Digitech Screaming Blues pedal. I thought I saw a pic here of some of the pedals they are using.
I took this pic in DC. I can send it to you in a higher resolution so maybe you could figure the pedals out that way...
(http://photos-a.ak.facebook.com/photos-ak-snc1/v322/118/45/142200011/n142200011_30227240_6347.jpg)