Just some extra info.  These plugins are for the sxwamp side of SXMS-3 only.  The way it works is faily simple.  You tell SXMS the output plugin (out_ files) where sound will be sent.  Then you tell SXMS the input plugin (in_ files) which will actually read the audio.

In some cases, an input dll requires some extra dll's (example, in_snes.dll requires SNESAPU.DLL and unrar.dll to run).

Most of these are their latest versions I could find, but there may be more updated versions floating around.  These were the ones I tested, so these were the ones shipped with SXMS =).