The time has come to collect the third and final Audio Reel. For this step you need a Pack-a-Punched weapon and the Apothicon Servant (the "Squid gun"), obtainable via the Magic Box.
There are six human bone parts scattered across the map. For each of the parts, the player needs to detach the bones with by shooting it with a Pack-a-Punched gun, and then absorb them by quickly shooting it with the Apothicon Servant. The locations of the bones are the following:
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In the Verrückt section, on the left side of the Corruption Engine while facing it, above a big rock.
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In Nacht der Untoten, at the roof of the bunker,above the portal leading to the Der Eisendrache area.
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In the Spawnroom, when standing on the Corruption Engine platform, look inside the church, above or around a candle.
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In the Shangri-La section, above Stamin-Up machine.
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In the Origins section, behind the VMP wallbuy, outside the map.
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The last one is a little difficult and be sure you've mastered the antigravity in Der Eisendrache well enough. Head to the Der Eisendrache section and wait till the antigravity activates. The bones are located on a wall, only seen when doing the wall-run outside the map. This 'wall-run' area can be accessed by jumping on top of this hole in the wall, via which you can jump on the next wall, entering an area of floating walls out the map's bounderies. Make sure you remain running on the wall and don't fall off, otherwise you will die.
The bones are on the lower end of the fourth floating wall. Best way to hit them is to use an automatic rifle an just spray bullets at this piece of wall.
Once all the bones have been absorbed, go to the top level of Nacht der Untoten where you will find the human bones in one pile on the floor.
You need to shoot them with the Apothicon Servant, absorbing them and spitting out a female corpse, which is Sophia's. Now shoot this corpse with the Apothicon Servant once again, leaving behind an Audio Reel.
This can be placed in a recording device on top of the excavation mound in Origins. Doing so will play the last audio file, and you can move on the the next step.