We were wandering around the crowded, noisy halls of this year's NAMM show when a particularly freaked-out drum pattern struck our eardrums. We followed the sound and encountered a gray-haired, bespectacled gentleman tapping and tweaking knobs so professionally that we couldn't help checking out his name tag. Imagine our delight when we saw it was no less than Roger Linn, designer of the Linndrum and Akai's MPC60. If you're not familiar with those terms, no matter: let's just say that Dr. Dre and any other producer who's banged out a synthetic beat on a box owes this guy their entire career. Mr. Linn has partnered with