Simon Cann has written books on sound design... somewhere on there I think you can still find a link to a free e-book.
http://noisesculpture.com
Howard Scarr was mentioned above, he might be one of the more important sound designers of our time, and now works for u-He (makers of the Zebra2 softsynth)... you might download at least the demo for Zebra2 and work through some of his tutorials on it, because Zebra2 is a semi-modular synth that once you learn some finer points about it, programming the Virus is going to seem like cake.
http://www.u-he.com