It was one of the stranger sights of late: On an early Tuesday evening, about 50 people were enthusiastically gathered in the middle of Spec's record shop on South Beach. They weren't shopping; they were staring. And the performer who transfixed them wasn't singing or playing a guitar. In fact he didn't even look up at his audience. Instead DJ Stryke (a.k.a. Greg Chin) hunched over a set of turntables placed in the center of the store and simply spun records for an hour, artfully segueing in and out of throbbing techno tunes, cutting the low end out here for a disorienting lurch, slamming back there for a primal rush. The clipped beats of techno aren't a sound heard too often in Miami's currently trance-obsessed clubs and raves, but it's a testament to Stryke's mixing talent that when he does get an opportunity to play out, the faithful will be there -- even at a spot far from the dance floor.