Yup, that is exactly it. Back in the day you didn't hear that nasal quality that he now posesses. And it is possible for him to sing without doing that. During the last show at Giants, a few years back, Jon sang a bit more like he used too, without so much of that through the nose stuff. Maybe it was because it was the last show and he didn't care, but I just wish he would go back to singing normally full time. It sounds so much better.