And if you want to get really serious you need to use acoustic sealant at all penetrations through the wall membrane (think outlet boxes, light switches, etc.)!
Do you have the space / budget to do a double wall? That will give you the best sound attenuation. Here are some wall construction options for you. The higher the STC rating (upper right) the less sound is transmitted. You can the resilient channel w/ sound batts does increase the rating (47)...
You don't need to tweak anything to make it work as you want. I don't know the sessions but it took about 8 years of playing time to get to level 15 in our campaign.
Unfortunately I am a terrible resource when it comes to published adventures. I have not run BG: DiA or CoA or any published adventure since 4e (and white plume mountain before that). I only buy adventures to mine for ideas and/or mechanics - I don't run them.
So I really have no idea if it is...