i'm in the process of finishing my studio and need to get some foam up on the walls. more importantly, i need to insulate the soundbooth for vocals and guitar amps with the stuff as well. most of the recording, if not all, will be happening in this 4x4 booth. auralex is way too expensive and i found another site that sells the same stuff for a little less. i'm going with the 2" x 12" x 12" tiles. what can you recommend to deaden the sound in the closet? we just built this room to include the 4x4 closet. i insulated the walls then put the drywall up. what are you guys using for soundproofing in a soundbooth?