Originally designed for Dinosaur Jr.'s J Mascis, the Zvex Double Rock Vexter is essentially two Box of Rock pedals in a standard "Vexter" chassis. And here's a nifty twist: you can turn each channel into a Super Hard On with the flick of a switch. Cascade each channel in any configuration you want - two distortions, two SHOs, a Box of Rock going into a Super Hard-On or vice versa.