I believe it is an option in the settings or during start of the game in main menu. During the game speechbubbles will appear with which you activate the commen

I believe it is an option in the settings or during start of the game in main menu. During the game speechbubbles will appear with which you activate the commentary. There is also the Lost Coast 'episode' which is more of a tech demo instead of a game but really worth to play through as well.