Selected the 4th knock sound from https://freesound. Org/people/timmeh515/sounds/413293/and applied some eq magic by boosting at 5 frequencies guided by ear.
Sound originally used for: curly reads: lost twin - the game [creepypasta]https://www. Youtube. Com/watch?v=ch5qlfgpnr0. Recorded with a iphone se and edited in audacity. Sound made by the curly one.
Two series of knocking on a metal doorhigh pitch knock on a hollow metal doorfaint sounds of footsteps on staircase in backgroundtwo sets of knocks, one longer than the otherrecorded on zoom h1.