Aurich Lawson | Getty Images It was just a stray remark at the end of a guitar lesson last fall. My teacher is a veteran musician whose band has had both major label and indie record deals, and he loves the analog, the human, the vintage, the imperfect. So it didn't surprise me to learn that he still likes to mix tracks with an old analog board or that he has a long-time "mastering guy" who finalizes the band's albums. What did surprise me was the comment that he had for some time been testing L...