The first part I saw Joe Satriani do in an interview while warming up talking about when Steve Vai and him trained together. It was some time ago. I don't know a lot of their music. It may have been in one of the Guitar World Magazine Dvd's I had. I think it's good to practice because you switch between diagonal angles. I saw the shape in one of the recent lessons I did and remembered it. There's some pattern where it sounds okay connecting them but I forgot. To make the shape E:5 A:6 D:7 G:8 move that shape to different strings, up and down the neck and invert it too, to mix it up more. The invert would be E:8 A:7 D:6 G:5
Got lost after that, was going to try and show this hammer on thing to make the fingers more stronk
Energy has been low, didn't want to talk now