We are in the process of soundproofing a room in an unfinished basement. The walls and ceiling have been insulated and we put on 2 layers of drywall with green glue inbetween. Next we plan to build a room inside this room. Now after reading Gervais' "Home Recording Studio" we realize that maybe we made a mistake in drywalling and should have followed his recommendation to have drywall, then insulation, then an air space, then insulation and then drywall again. Rather than taking down all our drywall, we are wondering if it would work to staple insulation to our drywalled room and then build our room inside. This would make our wall section look like the following going from outside the room (in the hall) to the inside: single drywall, insulation, double drywall with green glue, insulation stapled to drywall, air space, insulation, double drywall with green glue. Do you think this solution would work or is it not worth the effort?