It looks like, based on the write-up on that mod in the download section, that ver 3.2 is a combination of all the previous versions of Thomsen's sound mod.
So all you need is the 3.2 version. I think that's fairly typical; usually just go with the latest version of a mod. But, most of the time, the mod info in the download section will tell you what its compatible with, and which version works with what, etc.
