In soundtrack one there is a monster that follows the character and breathes down his neck. The red lines are the automation of a fader. The EQ below shows that the top, breathy end has been dipped out, with a slight boost at 1kHz. This was done to make the monster seem bigger and heavier than the character.
You can hear the sound in isolation here: https://soundcloud.com/svrdophobia/monster-breathe