I live in a duplex that has an open loft for the top floor. I have my music equipment up there and am trying to minimize the amount of noise that gets out of our apartment. Will soundproofing the walls I do have do anything or will all the noise just go out the open side? What do you guys recommend I sound proof my walls with. I don't need total noise reduction, but I do need something that will make a difference that is easy to install.