The subject line says it all. What's your sound proofing setup like in your recording studio? I'm thinking of converting my closet into a little recording space. A friend of mine has uses the foam-like insulation that you often find in microphone cases. He's got the bumpy stuff along the walls and the door, and when I was recording something for him at his place, it seemed to soak up the sound pretty well. What does everyone else use?