Project: Installing a 3/4" solid hardwood on plywood subfloor of 2nd floor house.
Our concern are the noise when upstairs. I was suggested the product floor muffler.
www.flooringunderlayments.com/floormuffler.html
I talked to the manufacturer. They said the product will work. They said the same material is also used in Lexus, Mercedes as sound proofing.
However, our installer said that the noise will just be transmitted thru the nail/staples. But most probably, it is an added work for them installing it that is why they hesitate.

Is this a good option for underlayment for sound reduction?