I think I spotted an Aoki track. Couldn't shake the feeling as I was wandering around in the early part of Chapter 12.
On a game-related note, it feels like there's huge chunks of story missing between chapters. They blow by so fast, with little rationality or character motivation. Remember Disc 2 of Xenogears? It's like that, but instead with like one sentence every time we get back to the screen with Fei sitting in a chair. In XG, even when it went into Visual Novel mode, it still told a well-fleshed out story. Here it seems they gave up 10 chapters ago.