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Insulation helps I guess my point was mineral wool doesn't really offer much more sound control then your standard fiberglass batt and if there is it's so minimal it's not worth mentioning but Roxul does do a great job at selling there product.
Like Hondaracer mentioned SilentFX or a similar product does work, creating an air space or additional layers of drywall is also a cheap way to create a better stc ratings. If I was to put a suite in my basement I would rip all the board off the ceiling, insulate and board it then add resilient channel and board it again.
There is nothing wrong with Roxul, it's a good product it's just expensive compared the the alternative. If you're doing small areas it's not enough to worry about, when I'm pricing large jobs the cost difference can be 10's of thousands of dollars so I almost always offer cost savings to switch to fiberglass insulation and there usually taken.
If you want google Insulation and STC Ratings, look at the wall/ceiling composition. The higher the STC Rating the better, you can see what adding different air space, thickness/layers of board and insulation does to increase it.
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