Has any one used Qiiet Rock. I am doing a remodel on a condo which has a party wall. I am trying to sound proof my wall(cut the noise by half) I don't know if resiient channel and 5/8 sheet rock will do. or use homosote with 5/8 sheet rock or use quiet rock. which cost about $95.00 a sheet. Any one know of some good web sites to read about the best sound proof tecs. Where can I buy a good decibel meter?