i did a search and found a thread but it was a bout building something i dunno.

my question,

can someone talk me through the whole guitar with synth effects thing. i mean the kind of sound on some of steve vai's stuff (http://youtube.com/watch?v=DP4NKowwo7k)

i have a line in on my comp which i can then run out to my Boss BR

any help on how to acheive effects like these??