I know we can't completly soundproof the garage, but I'd like to try and find out how much it will cost to keep the sound coming out it to a minimum. We like playing at close to full volume, scaled back a little, so we don't have any surprises when it comes time to gig. We've talked to the neighbors to the sides of our house and they were fine with letting us practice whenever, but apparently the neighbors behind us don't care for hearing us from 1-5 on Sunday afternoon. We've looked into getting a rehearsal space, but we can't find one within a reasonable distance of all of us. So, "soundproofing" the garage looks to be the best option for now. If we could get it down to where it sounds like a loud radio on the outside, I'd be happy, and I'm pretty sure the neighbors would be too. The garage is currently exposed stud walls with an open area near the roof that is completly open to the outside. So sound just streams out like there were no walls at all. We plan on closing the hole up and insulating, plus finishing the inside walls along with the ceiling. How much would it cost to do what I'm proposing? Is this just a matter of a ton of insulation, caulk, gypsum board, baking some cookies, and turning the volume down a bit more? Or do we need a ton of expensive pads, foams, mats, cement, etc... FYI We've got drums, a 100 watt guitar amp through 4x10s, my 450 watt through a 4x10, and a cheapo 80 watt PA for the singer. I play about 5-6/10 volume, guitarist is at 3-4/10, drummer plays pretty much all out. Other options to solve this would be tips on finding a cheap rehearsal space. Thanks in advance!