Hi! I'm sorry you are having such trouble and thank you for the feedback. The "e" key is supposed to be used when near an interactable, like a door or a puzzle. The "p" key is used to call the dog back to you, in case you lost it's position. The "o" key is used to send the dog to find a clue, so it's normal you hear it in the beggining and then stop hearing it. As for the voice, we used text to speech so it's a bit hard to understand it but it asically says the objective of the game, that you need to solve puzzles and follow the sound of the music to reach the exit.
Hope you give us a second chance!