When I took audio production classes back in high school or when things needed to be done for the radio station, the subject of records didn’t come up all that much. At that time, everything was all about tape, CD and the beginnings of digital. Nobody was really worried about getting something pressed onto vinyl. And so it came to be that although I listened to my fair share of records as a child, I had no idea how the things actually worked. I knew the basics of needles and grooves and whatever, but how they managed stereo sound when there was only the one groove rather than the dedicated channels like everything else has was always a mystery. …Until now. This is fascinating if you’re into this kind of stuff, and perhaps even if you aren’t.