What's That Sound

Some sounds that never used to bother Noah now scare him.  The blender, stand mixer, garbage disposal, and dust buster are just a few household appliances that scare him.  Although, I'm not sure about the dust buster because he doesn't really cry as much as much as he starts growling and getting beastly towards it, which makes me wonder if he just sees the dust buster as competition.  There's this show the babies like called 'Yo Gabba Gabba'.  DJ Lance is one of the main characters and there one's episode where he sings this song called "Be Nice To Everyone", and the last note is this really low note that he holds out.  Noah cries every single time.  He also cries when he hears really low sounds on any instrument.  But then there are other sounds, like the sound of one of his toys smashing against the ground, that don't bother him in the least.  He rather enjoys watching something that shouldn't be able to bounce off the ground defy gravity.