This is because there is an old OS installed in the Supernova. Download
the OS4.1 for the Supernova from the Novation website and install this
into the synthesiser. This new software will have many other benefits
besides activating the special buttons.
http://www.novationmusic.com/downloads.asp?productid=22&type=1
http://www.novationmusic.com/downloads.asp?productid=22&type=1