"Underground 7" starts out with a slow-building percussion match and then, two minutes in, it breaks down to a three-note keyboard hook, later joined by bass and a friskier hi-hat rhythm, that buoys things considerably. But once that initial jolt fades, that's about it—it's a nice, old-fashioned house groove, but it's one that more or less plateaus out.
The flip, "Underground 12," builds more gradually; it's lush in a very mid-'90s kind of way—boxy bass, sighs and exhales forming a deep backdrop, tense pads—and when the first cymbal crash brightens the sound picture about two minutes in, there's a jolt—finally, the beat will drop for real (though not for another 45 seconds or so). It's a lovely track, particularly if you like limited editions. If not, and if Tsuba really does keep its word, well, don't go broke worrying about it.