First code is 6391 reverse of 1936 Under My Skin by Ray Noble.
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.
Third Code is 5874 there are times when the audio is louder the length of these is this code.
Fourth/Fifth idk... still trying
(I know they have been cracked but this was the method I used to find them.)