This is nothing that can't be done. In fact I simply did not add more background sfx to avoid them being annoying: just the main character footsteps and door hiss when opening doors, and others just when you do things, solve puzzles and so on.
Something very little intrusive, so they give information to the player and not make the player deactivate sound as soon as he boots the game.
I could put sound of doors opening, even put some character moving from one place to another, but don't you think that would make the player try to find out what is going on? Or try to interact with that character looking for some clue? I'm asking because I would not want to put anything that could create a distraction.
Yeah, I know the character may be someone you can talk to, with no real involvement in the story, but I am talking about something more general.
Seriously, I am looking for ideas, as I just could not come up with anything convincing
