Highlights for this maintenance release include:

 o Read support for Ogg Opus files.
 o Read support for RF64 WAV files.
 o Deemph can now be used at 48kHz sample rates.
 o Rate is now much faster in many cases.
 o Support multi-channel LADSPA plugins and optional latency compensation.
 o Many other bug fixes.

For an extensive list of changes, see the ChangeLog at
  http://sourceforge.net/p/sox/code/ci/sox-14.4.2/tree/ChangeLog