MPSはMpeg Surround の略。あるいは、MP3 Surroundのこと
Encorder
http://www.iis.fraunhofer.de/en/bf/amm/download/software/
http://www.iis.fraunhofer.de/en/bf/amm/download/software/download/download/index.jsp
Player
http://www.all4mp3.com/tools/mp3HD-tools.php