I've got that album sitting in my downloads folder. First track is Brave blue, the second track is something different (which isnt even on AO for some reason), and the third track is the Days remix (which is the song you linked to, which is what I mentioned above about Days, but that's not the song you want :(). You can try asking on this forum and seeing if they may know, which actually may be the best course of action. They're pretty knowledgable about that stuff, at least those who are still active anyways.
From what I can tell, it's not on OP, OP2, Insert Songs, OST 1 or OST 2 (I've got all the albums from AO downloaded as far as I know). Went and blazed through them all to make sure I wasn't missing anything, and I can't believe it's not on any of them. The closest is that last song on OST 2 (like I mentioned above). I can double check again tomorrow and see if I'm missing an album, or it's in the middle of a track and I just skipped over that part.