That means you have to hook itunes control "bangs" (provided by a module) to the visual "elements" in the theme (provided by a module too, but not necessarily the same one). It's like hooking up a new head unit for your car stereo. You don't get a new car just to update the stereo - at least I hope not. And you don't have to replace all the speakers/amps/subwoofers either. =P