(This is one of the questions in the FAQ, but I don’t know if people aren’t understanding what I’m trying to say or didn’t know that an FAQ existed…)
If I post a voice clip or dialogue and it’s tagged as “hidden audio”, it literally means that this particular dialogue was recorded during the production, but did not make it to the final cut of the game for whatever reason. It’s tucked away within the audio files of the game that is installed in your computer. The only way to get to them is to (digitally) rip open the audio files and listen to them. In other words, you cannot trigger the dialogue at all during gameplay.
Think of those posts like “bonus scenes” from movies when you purchase the DVD. Only difference being that it’s from a video game. 😆
All Sounds of Assassin's Creed 