I'm not sure if this is in the right place, but I hope it is. Anyways, a friend of mine is going to use her spare room in her condo as a jamming room. So she needs to make it Soundproof, not 100% cause she wants a DIY, doesn't want to pay bucket loads of money. She needs it soundproofed so her neighbours don't complain. Is thick foam on the walls a good idea? Please help, thank you.