Hollowcall is a story you play by ear, so every line in it is voiced: 1,618 of them, across 17 voices, from Nora's orders on the first night to the last words of the epilogue.
Each line is checked against the script before it goes into the game, and all of them are levelled to the same loudness so a whisper never comes out of nowhere. Unless it's meant to.
With headphones on, some voices come from one side. The radio in your left ear. Someone behind the door on your right. That is where the forest does its best work, so we recommend playing with headphones, somewhere dark and quiet.