This group was essentially thought of after I got a new amp home, glanced at the controls and went "Hey, this goes to twelve. Take that Nigel Tufnel!". I've been looking for an excuse to make this since and finally found one. The only requirement here is that your amp goes past eleven. Twelve, fifteen, twenty, thirty, or that one-of-a-kind head Nigel claimed to have that went to infinity, if it can be higher than eleven, it has a home here.