This step can only be done after step six. Collect all audio logs on the way to the rooftop. The audio logs look like Power-Ups, but they're in the shape of headphones.
Audio File Locations
The steps leading from the spiral starway to the top level of the Citadel Tunnels.
In the center of the room that has Double Tap.
In the center of the Cell Blocks. On the same floor as the wolf head. Right after the steps that lead to the wolf head from the Warden's Office.
In the Infirmary directly in front of the door that allows access from the top floor of the Cell Blocks.
In the doorway that leads to the Roof.