Flooring Floor Pad

I want to get laminate flooring, Pergo now has padding already on it but..?
this flooring is going on my second floor; would I still need the sound blocker padding even if Pergo floor has padding already on it? Or should I just have both down for extra sound blockage?
Even though the underlayment is attatched to the planks, I would use cork underlayment on the second floor for extra sound absorbtion. The cork will also help take some of the "hollow, clicky" sound out of the floor.
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