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First thing's first.
1. Sound proofing
2. Room acoustics
Two very different problems.
Room acoustics are subjective, so I will address Sound proofing here. Soundproofing is like the speed of light - you can get close, but you can never totally get there. Steve, If the soundboard is 1/2 inch, and you can cover the WHOLE room with what you have, including the ceiling, keep it. After it's painted it won't stink, and it has some amazing sound properties, but I think it's also a fire hazard! If not, take it back and get the much less expensive 5/8 inch sheetrock (unless your room already has 5/8, in which case you get 1/2 inch). The 1/4 spacer boards will work, but be sure you cover every surface in the room completely, and use sound caulk to seal EVERY seam. If air can get in, so can sound. If you have a window, and you can't cover it up, put an inch of foam around the entire frame, and put another window on the inside and air seal it. You can put up all the heavy wall and ceiling material in the world, but all that noise will still go through a regular window like an X-ray.
Better (for sound-proofing) than the 1/4 spacer would be to get that window/door insulation they sell at Home Depot. It's green and made of plastic, about 1/8 thick, and it's got air in it. It's 3 1/2 inches wide, and comes in a roll of like 20-30 feet. It's real cheap. Glue it (or use contact cement) to the sheetrock around the outsides and a couple strips in the middle, and then glue that to the existing wall. Better yet, put the green stuff on the existing wall first, straddle 2 pieces of sheetrock over it, so their seam is over it.
There will be no screws to mechanically couple the 2 wall layers together, and the green stuff will also air seal the second wall.
R
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