Adam has a foot drum, I made a stomp box out of a cigar box, some use loop pedals and some people just stomp or tap. I thought that Scott Birams' way is very interesting.
Scott Biram's playing (and singing for that matter)has a really belligerent attitude to it... really powerful stuff (I'd aleays assumed he was the kind of guy who, though he plays blues, was more into the likes of Slayer & Metallica for his refernces
