So, after I reached the Tunnel of fear (maybe it has another name, it’s called like that in Spanish), the sound has stopped if I play the game on my monitor.
When I start the game, all the audio from the logos and that stuff from the beggining is perfectly audible, but once I skip them, the game blinks (like and alt+tab) and then the sound stops. But, if I play the audio in the laptop, it sounds without any problem. As I said, audio was playing fine on my monitor before.
The monitor is an Asus MX25A, any other game the sound plays perfectly.