You can hear a disembodied voice near the bathroom. It comes from just outside of the bathroom and is best heard while in Spectator mode.
Just outside of the bathroom on Asylum, exactly where the disembodied voice is heard, a crying girl can also be heard. She will switch back and forth from crying to laughing,which is quite disturbing.
All around the stairs that are a distance from where the piano can be heard, you can here the sound of knocking on the wood that is covering up all the windows. If you fly around constantly as a spectator you can hear this wooden knocking sound everywhere. It distinctly sounds like someone deliberately knocking on wood and can also be heard on the boarded up windows on the other side of the map.