What is Libertine's bonus ultrasonic file?


I have been meaning to ask this for a long while, what does the ultrasonic bonus file contained within Libertine do? And should I play it whilst the supercharger is running? Or after/before?


The super charger has utlrasonic file in it. But it is of 9 mins. So,Saint was kind enough to extend the 9 min scripting onto a 30 Min stackable module. It is the same 9 min scripting in the super charger times 3.


What stack module?