This doesn't have much to do with guitaring, but my bro back home just insulated a garage with the hopes of using it as a practice/jam room throughout the winter. Anybody know of a cheap and pratical way of sound proofing it so the neighbors don't lose it again?

- 3/4 or 1 inch wood siding, insulation, and vapor barrier is all that's up there right now. We were thinking those flat egg cartons or covering the whole deal with plexy glass but that'd probably suck accoustically.