If I wanted to see a glorified karaoke session with wota, I'd see a Perfume concert.
If you can find me girls that can make heavily synthesized electropop with only their vocal chords, they need to be signed right away because a real-life Miku Hatsune would make a ton of money. The amazing production quality and crazy choreography of Perfume's concerts easily makes up for their mostly non-sung nature. That's kinda the focal point of that group.
Even though the vocals aren't that great, it's more enjoyable because you can see them giving it their best effort.
So they probably pick and chose which performances to 'fix.' Also i'm very sure most LoD stuff is live(though I have my doubts about S2) by most i mean maybe 1 or 2 tracks not but you can hear breathing on these so yh...