Shalom Interrogation | Path to Nowhere (PTN) 

Chief voice does not exist in the game.

Dreamy bubbly where Doyle is drunk and prologue scene with Hecate, only instances besides this one where she speaks.

There's a brief speech of Chief's in Night of Wonders event and it's voiced

1:45:10

Not sure. I think it's one of the base BGMs. You can find all their BGM on the official Path to Nowhere channels including the Path to Nowhere YT channel.