Ok so I opened the door in Against the door. Code is 6391 reverse of 1936 form the song under my skin. Was gonna continue but it made a loud dog bark which kind scared me and I didn't want to wake up anyone since its 3:26 AM. Anyway enjoy can't wait to see what I and you guys find tomorrow
EDIT#1 Second code is 4692 if you record the audio and there is a guy who says 1234. If you count the number of seconds between each number the guy says it is this code.
EDIT#2 Third Code is 5874 there are times when the audio is louder the length of these is this code.
EDIT#3 I am a little stuck now, in the fourth stage you are given the numbers 14 9 11 17 in this order but the amount of time between them is to large. Tried converting them in to letters which yielded jghl but the game doesn't accept letters. Also appox length between segments is 11 10 10 10. The first one could be 10/11. Counted Syllables which are 2 1 3 3 no luck. Subtracted length in seconds from numbers given, no dice.