This is so cool! We should definitely do something like this
If you need a mixer, I can probably do it, though I'm not much of an audio editor, so I can only really do basic things like have the instrumental and then just cut/paste to time everyone's voices in. I don't really know how to do any echo effects and stuff so it'd probably wouldn't be as good as this lol
The only issues I found in this would be that 1) there were differences in mic quality (which can't really be helped, so not really an issue) 2) some parts were timed a bit off (which could be fixed with editing, again not much an issue) and 3) there's a few lines off key (which didnt happen so much, so yeah)
But in terms of singing ability, everyone's voices sound so unique and interesting, and everyone sang well!
Some of those Tsunku sounds though...it's scary good Tsunku impersonation (unless you guys used actual Tsunku >.>)...especially the line towards the end.