Hidden messages

I hear 'tousan', but I've never heard the 'aitai that Wikihouse talked about :/

It is EXTREMELY SOFT. Almost like a silent whisper. You have to turn up your volume quite a bit to discern it(I had to do this even though I was wearing headphones). And even then, it's kind of a stretch to say that those breathing sounds(that's what they really sound like) actually are supposed to say 'aitai'.