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when I built my wall, I set up the bass amp and the drums in the live room and had somebody play. ( It was a double wall construction with a gap). To my dismay there was not as much isolation as I was hoping for. I added another layer of sheet rock to each side and that did the trick!
You don't say how thick your cement board or sheet rock is. Why not just finish the wall the way you have it and test it out with bass and drums? You can always add mass or add the second wall if you don't like what you hear.
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