Every heard that robot from Buck Rogers? yeah, I'll forever bring him up in regards to Vocaloid. focus on that nonsense noise he makes before sentances. To me this is how fast tempo'ed Vocaloid song often sound even now. I don't rate Vocaloid as too realistic at a certain speed.
I know Two-faced lovers, isn't one of her most realistic sounding songs.
Saying that... Bones has a nice realistic tone when he sing certain note length. Marie Orks is not so good, but you still get an effect. If you hold down the key for AE vocals for a length and then, without letting go, hit a second... You get something. Actually Marie has a better effect here then Bones...
Well Risky Game isn't even that fast of a song. Its BPM is only about 130.But yes I have noticed that he does get a bit of an auto tune sound when he has to sing the more cluttered parts.