Particleboard or Pressboard—Will They Fully Off-Gas?

We're remodeling my house, and my husband put some "sound board" on the studs under the dry wall to help with sound reduction. this "sound board" smells HORRIFFIC! it seems very similar to particleboard or pressboard. we're hoping that placing the dry wall over it, would essentially seal it, so the smell/toxicity cannot come out. however, not sure if that theory will work. or, are considering getting rid of the sound board all together.