So it appears that sound is more the issue... Just so happens Fire Wall type assembly is best result for effect. Staggered stud bays, minimum opening, full insulation, thicker rock, and fire padded boxes. Add a hat channel to framing before rock to further minimize vibration... One step above that would be to build two walls seperate from eachother.

Click on "putty":
http://www.3m.com/us/arch_construct/firestop/catalog.jhtml


Mark Heller
"Well - I oughta....." -Jackie Gleason