I don't really think there's very much left in identifying where a beat comes from these days. Most of it is just house music. The technology has advanced to the point that people have access to music from all over the place. You're not going to just hear East Coast shit in NY anymore, where ten or so years ago all you'd really hear is Big, J, DMX, Ja, Blige... etc.
I've never even put an ounce of thought into it, but anything past Anghellic, and I couldn't say this way or that which region of the country the beats come from. Especially since on AP a lot of his shit was from Europe, which was crushing on the techno/industrial scene at the time.
Nobody was rapping over a beat like AP...
And that's why I liked Tech in the first place. There was no way to label it, really. I mean, Tech is for people who like DOPE MUSIC. Simple as that. If you don't like even one song from Tech, I don't think I have much in common with you... lol.