I’ll take the blame for this confusion! The world is a complicated place, and as @tomatitito correctly points out, we came up with these ideas based on what we saw out there. When I came up with the ‘2wps’ concept, I didn’t even know there were players like Steve Morse and Carl Miner and so on.
Anyway they’re not “different techniques”, per se. When you talk about alternate picking technique specifically, it’s a system of layers, each one built on top of the lower one:
-
Physical Movements
shoulder, arm, elbow, etc. -
Pickstrokes
single escaped (the ‘linear’ ones), fully escaped (the ‘curved’ ones) -
Picking Style
pickslanting, two-way pickslanting, crosspicking
Pickslanting is when a player plays only single-escaped pickstrokes most of the time. A Two-Way Pickslanting player is one who plays sequences of single-escaped pickstrokes, with occasionally, one or two fully escaped pickstrokes thrown in. And a Crosspicking player is one who makes continuous sequences of fully escaped pickstrokes.
The key here is any movement can be used for the pickstrokes - elbow, forearm, wrist, fingers, etc. Doesn’t matter. That is the lowest level of building block, and the other two are above it. However, out there in the world we have noticed some correlations:
2wps players tend to use forearm for their fully escaped pickstrokes while using wrist or elbow for the singles. This is why you think of the 2wps player as someone one whose arm remains stationary most of the time, but occasionally flicks rapidly on certain pickstrokes. That’s just the fully-escaped pickstroke being played. If you only make one fully escaped pickstroke and then make singles again, you just switched from one pickslant to another. If you make two fully escaped pickstrokes back to back, and then play singles, you just switched, and switched back rapidly. That’s the “primary pickslant” approach we see in players like Batio, Andy Wood, and so on.
In the crosspicking world we have players who use some amount of their forearm on every pickstroke, like Martin Miller and maybe Carl Miner. And we also have those who do not, like Steve Morse and Molly Tuttle. Again the movement doesn’t matter, that’s below the pickstroke level. Use what you like. What matters is that crosspicking players are doing this on every note. A “crosspicking” player and a “two-way pickslanting” can both choose to make their fully escaped pickstrokes with the same physical movement. But 2wps is a style where you only choose to do this in units of one or two notes before going back to the linear movements. And crosspicking players can just keep doing this.
It’s worth noting that most 2wps players aren’t good at continuous sequences of fully escaped pickstrokes. That’s why you don’t see lots of 1nps arpeggio playing or pedal tone type playing in rock. It’s why most players simply can’t play Van Halen’s “Hang Em High” or Yngwie’s pedal tone lick.
It’s also worth noting that the wrist-only type of fully escaped pickstroke is much more common in bluegrass than in rock, and seems well suited to roll type playing as we’ve seen in Molly and David Grier’s case. Could you do that with continuous forearm movement? Sure, absolutely. But again, trends and correlations. Line up 100 bluegrass players and you will not see too many Jimmy Herring style forearm players, though you will probably see bits of it here and there.
So, what happens when a player makes the single-escaped pickstroke, the forearm type curved pickstroke and the “wrist-only” curved pickstroke? In other words, all type of pickstrokes, in several different physical methods? What do you call them? Andy Wood is a great example of this. When he plays scales, he uses forearm fully escaped pickstrokes for ascending inside string changes and a wrist-only fully escaped pickstroke for descending outside string changes. In between he plays singles. By our definition above, that still fits “two way pickslanting”.
Anyway, chew on that for a while and see if you think this makes sense! I think it holds up. For the moment, anyway.