Here is a new product that I just discovered, its called Quietrock and their claim is that 1 sheet of their 525 product (which is 5/8”), is equal to 8 sheets of 5/8” drywall (acoustically speaking).

As you can see from these videos it works really well. So here is the thing, you can build a home recording studio with relatively good sound proofing without doing major construction to your house. This would be a first step in gaining a quiet control room. Remember good sound isolation from the studio to the control room is paramount.

Links to videos:

Holmes on homes
Quietrock - The sounds of silence