So in new construction here...
I want to sound deaden bedroom walls from outside noise. Traffic, storms, loud people, etc. I know I can't achieve 100% due to a window. (I have plans to make a foam insert for that when desired for extra quiet-ness) Ideally I would just do 1/2" drywall - green glue - 1/2" drywall. If I do this, my premade window jambs will be about 1/4" short of reaching the plane of my drywall. Is there a better way that does not require 1" to 1-1/8" thick drywall?