Guy in area is selling his "high grade, high density professional acoustic foam" He's selling the 2 in. thick 2 ft x 4 ft panels for $12 each. And the 3 in. thick 2 ft x 4 ft panels for $17 each. Here's the manufactures site of the product. McMaster-Carr You think these will work good. Not sure yet how bad sound reflection is yet in my room (yet to record), but I think this is the best I can get at a low price. They have been used and removed, but looks to be in good condition to reuse. And by the way, to hang them, is it alright if I velcroed them to the walls? Was thinking I might can quickly remove some if I wanted to have a echoing effect on vocals. Or what would you use to hang them for quick release? Can you achieve echoing effects through sound effects after recording? As good as real/actual echo recording? I think other than this, for now I would have to use this or moving blankets for my budget. Should I use the 2" or 3" thick ones? I was thinking 2" thick. And do you think this stuff is actually safe to breathe? Do you know if it's toxic if a dog ate some?