1.I've listened to the Slender background muziek max intensity. Why don't they play it this loud in the game?

The reason they don't is because they want to force the player to think they actually are in a forest being chased door Slender Man. If they did play the muziek that loud, the player would hear it and realize, "Oh yeah, it's just a game!". However, in later games such as Hospice, when Slender appears, a high strings cord is played. The reason this happens is because the player is used to silence. When the cord is played, it startles the player and rattles them even more. However, to solidify...