The box might be small, but it's impact is tremendous. This sizzling musical documentary reviewing the history of the guitarist's "fuzz box" includes enlightening details about its engineering, how musicians manipulate them to capture distinctive styles to call their own, and controversial issues like the practice of "gooping." Features appearances by Clif Taylor, Billy Gibbons, Jon Spencer, Chris Ross, and others. 91 min. Soundtrack: English Dolby Digital stereo; bonus footage.