I'm looking for recommendations for sound deadening / sound proofing products that I can use in my Man Cave (where I play my guitars). This room is located in my basement. When I built it, I did insulate the walls and ceiling with a drop ceiling. The floor is carpeted and there is some furniture in it so there is sound sound absorption already. I was looking for some panels to put on the walls and to add to the door that goes into the basement. Thx!