In the words of Greer:

Looming large, like the towering behemoths of full stacks of yore, the Black Mountain Crunch Drive roars to life, bringing new dimensions of vintage tone to guitarists (and bass players, too!). This new crunch drive is rooted in a tone quest for the sound of one particular recording of a crunchy British amp, but it has flexibility beyond just that sound. From simply adding crunch, to getting that famous midrange snarl and growl of those metal panel amps that came out just after the plexi era, the Black Mountain Crunch Drive gives up the goods in a way that has a natural, amp like crunch to it.