Ok, although I think it's crazy, I think I know how to get (read) password from a sound file. But I'm on Linux and I tried with Audacity and pressed some buttons but nothing does change much. Someone said you have to press more buttons in Audacity to make it work, but that's too many combinations since there's dozen options (effects) you can make on file.
So how can this be "so simple"? I'm stuck, any tip?