Austrobogulator: I didn't even know there was an audio guide thing?
More like an Audio Tour, actually. It's a new game mode that you unlock after you beat the game for the first time. In it,
the game map is filled with exhibits and 'audio booths' that dispense cassette tapes with audio commentary from nearly everybody involved in the game: game designers, writers, coders, graphical artists, and voice actors. Highly recommended to give it a second playthrough with this mode on if you liked the game. Plus, it helps you find stuff that you may have easily missed the first time around (like I did with the raccoon :P).