just an fyi if you start randomly hearing sounds like a chain saw, beating heart or screams, its your chat function because tumblr randomly changed the sounds without any warning.
Update:
you can turn it off by opening any chat window, clicking the three dots, and clicking “Make the spooky sounds stop.” This should restore the normal notification sounds.
*deep menacing accent* “How did you take down Captain America?” *matter of fact European accent replies* “We shot him in the legs because his shield is the size of a dinner plate and he is an idiot”