Passing by here every now and then.
Had just listened to this version http://soundcloud.com/marksherman/secrets-by-one-republic

If you're looking for perfection, I think the first thing is to get Kaoru to rerecord using tools like nabz did. Either Kaoru's voice does not suit the song, or her recording tools made her sound like she has a blocked nose.

Then those vocal syncing problems, imho should be tweaked during mixing. In this version, Kaoru's vocal track came in a tad bit too fast. It always starts slightly faster than it supposed to.

Instrumental sounds pretty awesome if you ask me.