1) It sure sounds like there are a lot of punches on this vocal track, so much so that I'm not sure that they're all punches at all. The ones that are obvious are on the "Hello" part in the song's B sections. These were obviously just one section that was flown in as needed, with the initial breath being cut off.
2) As with most of the songs that we've listened to this week, there's a nice long reverb on the vocal. In this case it's definitely delayed and the top and bottom end is filtered a bit so it fits nicely into the track without sticking out.
3) Another thing that we've seen before that's also used on "Teen Spirit" is the arrangement technique of using a single lead vocal in the verse, then doubling it in the B sections and choruses.
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