Source : Free On-Line Dictionary of Computing

Lossless Predictive Audio Compression
     
         (LPAC) A {lossless} {audio} {compression}
        {algorithm} with compression ratios from 1.5 to 4, depending
        on the input.  Software is available for {Microsoft Windows},
        {Linux} and {Solaris}.  LPAC files (*.pac) can be played with
        a {Winamp} {plug-in}.
     
        {Home (http://www-ft.ee.tu-berlin.de/~liebchen/lpac.html)}.
     
        (2001-12-17)