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.

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What stack module?

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