"Recording the crowd noise was obviously intentional, since all of the audio signals the pair are manipulating run direct, meaning no microphones are required to pick up ambient sound. If they'd recorded directly from of the signal running to the soundboard the results would have sounded like a studio album of extreme self-remixes, which would probably have been extremely interesting. But Justice are all about the spectacle; even if you weren't there to appreciate the show in person, they'll make damn sure you know that 2,000 others did".