I'm either completely used to the sound/roar or it has gone down. It's still there, but I love the sound. Much quieter than the NT-01's I had run in the past. My RS-RR's are wearing super nicely too. Nothing funny going on. Super happy.
I was afraid that they would only get that much LOUDER yet as they wore down to slick territory, like so many other gumball type tires.