At the begining of the sequence there is heavy breathing which puts the audience on edge as they know that the main character is scared. The diegetic clangs of metal which start at 0:09 get more frequent which heightens suspence as you do not know where they are coming from. There is an eerie sound at 0:48 which builds in volume and foreshadows what is about to happen. It is suddenly a lot louder when she put the knife into the curtain which conveys danger to the audience. There are a few moments of complete silence which contrasts with the sharp metal noise which has been amplified and the scream. The hand banging on the window at 1:12 is contrapuntal to the scene.
The diegetic music that turns on has a very old fashioned repetitive style which paired with the deep knocking is quite effective in freaking out the audience. The noise of the locks opening at 1:23 plays on the audiences idea of safety and is very relatable. Before the door opens there is a very deep noise which could represent the dark nature of the being/person behind it. From 1:36 onwards the eerie music builds from earlier in the sequence. The knocking that you hear at 1:59 is a lot more human like and less mencing, but the audience would find it hard to differentiate between the two. The shriek in the main characters voice shows her despertness and want for normality. The music on the record player slowly increases in volume before abruptly cutting out.