SoX (also known as Sound eXchange) translates sound files between different file formats, and optionally applies various sound effects.
Program URL: http://sox.sourceforge.net/
hobbes: http://hobbes.nmsu.edu/pub/incoming/sox-12.17.4.zip
Search: http://hobbes.nmsu.edu/cgi-bin/h-search?key=sox-12.17.4
Source: OS2VOICE