Lol yeah, I have that to. Dont know if it's the same for you but I have a thing where I think when your really high, what your thinking is louder. Like if you really sit in silence and think of a song you can hear it deep in your mind but when your high it's louder, so when you think you hear something it echoes and then you start thinking of other sounds that sounds similar to the one you just heard. Might sound strange but thats the conclusion I've come to from hearing weird sounds when i'm high xD.