okay, if you're serious about satch speeding, then you have to start with left hand only, dont bother trying to pick the notes just yet - listen to satriani, he has some of the easiest whips around, at least most of the time, well you nkbow what I mean...but get good at 3 notes per string sweeping pattersn first and foremost - just pick the fret randomly, listen along to the song, find your way back to the key - find the modes for any fret position...just go by ear, you must get off the ground with your ear or else you will go nowhere...it's quite easy - just find your way, trial and error until you are playing one mode up and down 3 notes per string and go all the way up, all the way down, then on two and three strings just go up down etc

try tapping also - try tapping with 4 fingers on your left hand and 3-4 with your right on top of that, at the same time...its very simple just repeat it a million times and as with everything else you're a super-master ;)

seriously...just get a thythm going with the notes, also try that with 4 fingers on one sring, the with any random spaing for fingers, gaps etc...and try maybe some other slight variation, keep all them in the same modal arrangement, and keep 3 per string to start out - just go for up and down and speed and it really doesn't take much except just performing the movement, over and over, and suddenly its like "hey" I can do this also now, hmm that's so easy too...blah blah...and it is easy...but you have to be there hitting it out with the random hit-and-miss voyage through the rough...it never ever ends...to the guy that plays at light speed (the best players), it's not nearly fast enough...so they realize they really can't play sh!t, but everyone else thinks they are the greatest...