I'm not really big into jazz yet, but I'm getting there. Anyway, I picked up an RCA Direct Masters copy of "Trackin'" by Lew Tabackin. Direct to Disc. Virgin vinyl. Insert that had the room size and frequencies, mics used, amps used, lathe...you get the picture. I bought it because jazz interests me and I'm a sucker for anything with "audiophile" as a selling point. It's pretty fast and squirrely hard bop. So one day I put it on and something's off, but I can't quite place it... It's a 45 and I was playing it at 33. But I only barely got what was going on, because it actually sounded like normal, mid tempo jazz.