They we talking about how they work on the game's sound design in a way that they create a main, theme track for a specific segment and add additional layers of music depending on the situation. Imagine them creating all those tens or hundreds of short tracks like this for the entire game, just to be able to blend them at the right time so the music actually works along with the pace of the game. That's how I imagine it at least, the PAX footage shows promise in this regard.
I will try to look up the interviews/articles I read about it in, but can't promise it will be today. Watched too much of those *cough*Mamais*cough* interviews
