i did in fact try it today, but i only could get the first part of the faq to work... that is, i got to the programmers ending and the music room, played some music, and there is a shadow of kid. If you exit, equip the spectra swallow, enter, then go to the menu and go to status and look at serge with the spectra swallow in his hands, then go back to the game, and the shadow kid, although only still half visible behind a wall, is now wearing her orphanage costume. However, i could not make it any farther into the instructions that this faq tells of, as no matter what songs i played, even the ones the faq recommends, i could not get a favorable response from her. ( i either got nothing, or an animation of shaking her head no)
i wish some one else would give it a try, i'd like to know if the rest is true.
also, in the faq i read, it said that the door that is "completely locked" was hacked into, and after some crazy processes, they found it to be a debug room where any place in the game could be accessed. it was something for the game testers to use, and was never intended for everyday game players to ever use. anyways, that's my progress and what i understood of the faq.