Alot of really good info here: http://www.ccsr.uiuc.edu/People/gmk/Papers/ChuaSndRef.html -- Scott Gravenhorst | Linux Rex, Linux Vobiscum -- FatMan: www.teklab.com/~chordman | RedWebMail by RedStarWare -- NonFatMan: members.xoom.com/_XMCM/chordman/index.html -- The 21st century does NOT start in the year 2000!!!