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The Antigravity seminar is getting a little old at this point, and we no longer use the term “two way pickslanting” to describe scale playing. Mainly because it is vague, and does not describe what type of picking motion you’re actually supposed to make.
The short answer is that the way you play odd numbers of notes depends on which type of joint motion you are using as your primary motion. The upcoming Primer update will explain this more clearly, but basically, not all joints can really even play a scale by themeslves. The elbow is a good example of this. When Vinnie Moore plays a scale, the elbow joint can only do downstroke string changes. To get the upstroke, he uses either swiping, or a very small amount of forearm rotation.
Wrist technique is different. The wrist can make both escapes and it does not require any rotating motion of the forearm to do this. So when players like Andy Wood play a descending scale, the forearm is mostly stationary. The wrist (i.e. the hand) simply changes direction to get the other escapes.
So, what should you do? The simplest answer is that the very first step is to get a joint motion that moves fast, and then you would use only that joint motion at first. It doesn’t matter what kind of joint motion it is, whether that is elbow, wrist, wrist-forearm, etc. Any of the motions we teach in the Primer are fine. However you should not try to “do pickslanting”. You are trying to do a fast joint motion, that is all. Even if you did only this, with good hand sync and good muting, and completely ignored all string changes, you would basically be doing what Batio does when he plays descending scales in the Antigravity seminar. And we know how good that sounds!
So… in your clips, your alternate picking motion looks like some kind of forearm or forearm-wrist motion. However it doesn’t look completely smooth, and I’m guessing this isn’t your best motion. Have you taken the table tapping tests, and what results did you get? i.e. What were the metronome numbers for each joint motion? Did you do the tremolo test, and which motion did it turn out to be?
That’s the motion you should be using to start with here.