I keep thinking about Jami's setting example from yesterday, the one with the soundproofed room. I think there are two basic types of soundproofing -- the kind that keeps sound from leaving (or entering) the container, and the kind that also changes sound within the container. For example, sound booths are designed to muffle echoes and feedback.
With that in mind, how would you describe the quality of sound inside either of these soundproofed environments? Does it depend on the kind of noise being made? If you want to take a stab at a sample and post it in the comments, it might make for an interesting roundtable. Keep your examples brief, please, no more than a couple hundred words. We're not telling stories, but trying to achieve an effect in a few sentences of action or description.