SupremeEx, the producer behind 2000’s impressive “Projecto: 2501” EP, now comes with an interesting and well-developed 7-inch. The A-side, “640 Caravans Making Right Turns, ” (no, I don’t get the title either) is the sleepier of the two, though the underlying thumping drums keep it from getting stale. The flip, “Angelic Groove,” continues the A-side’s loop-stacking theme, but colors the atmosphere more than creates nifty polyrhythms. Nice.