I had the same problem, but my friend suggested that I try using the egg crates made of foam to absorb and bounce off sound. So I did and now my studio is a lot more quiet than it was before but not completely "sound proof"
you can't basicaly.Not without spending a "shed load " of money. Sorry for the pun but thats the truth.
I can answer this question...
How can i sound insulate my shed?
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