And loop technology is way past simple repetition. You can't be me, I'm taken
If they did the scratch effect with some other device or on the computer, and just pretended to do it with the patch box, that would be cheating. If they made a click sound electronically and showed it as closing a classic If they muffled the bass drum (their September cover) electronically but showed it being done with a muppet hand puppet, that would be cheating. And confer where they have the keyboard that is clearly computer filtered, they have both the keyboard and the laptop in one of the shots.
Its all samples mixed together, but they claim, at least, to show where all the of the samples come from in the video.
... though maybe La Vie en Rose is more apropos ... I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.
I'd bet on the opening harmony being autotuned, because it's just a little too perfect and shiny. But after that it gets less clear. There's quite a bit of timing slop on the vocals, which suggests live recording for at least some of the harmony lines.
Not that I'd want to be too picky - it's a very good cover, and I like it a lot more than the original.
And of course, there's no promise to show every sample they recorded, just the ones they used. I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.