hi..
i'm sure there are better resources out there..
but try here
http://www.soundonsound.com/sos/allsynthsecrets.htm
Start with this
http://www.soundonsound.com/sos/may9...s/synthsec.htm
also..once u understand the basics of subtractive synthesis....read the manual of your virus and reverse engineer as many preset patches as u can...u can learn a lot that way...