We Were Here Forever

Next, the second player remaining at the bottom must play 6 melodies on the musical mechanism. Melodies are played by 4 notes, for which the letter keys are responsible. These melodies must be played in a certain order. Hints for notes and melodic order are divided into two parts. The first player has one in the room behind the portraits, and the second player has one to the left of the musical mechanism.

After this, both players stand on the platform behind the musical mechanism and pull the handles together. After this, a cutscene begins.
At the end of the cutscene, both players exit the castle through the main entrance and take the elevator down to the fork to the next puzzles.