I’ve been going through the newer material in the pickslanting primer, and re-watched the short video describing finger joint motion (and its relative rarity as a primary motion mechanic). I was really intrigued by the mention of “circular” picking by Eric Johnson in one of the clips.
A while back (a long while), I posted a topic in here wondering if it would be possible to develop a motion mechanism that’s even faster than any single primary, by alternating more than one joint motion–for example, to do a downstroke with the wrist, followed by an upstroke with forearm rotation (and so on). Partway through that topic, I proposed that using THREE motions in sequence, such as wrist, elbow, and fingers (example sequence: WD EU FD WU ED FU) might have potential. That old forum topic is here: Could there exist a picking tech with alternating muscular motions?
It generated some good discussion, and I was eventually more or less persuaded that it’s just not possible to chain together three motions on a single string continuously. (Maybe not 100% persuaded.) But I did experiment a bit, and it’s definitely possible to chain together faster-than-expected speeds over a three-note sequence by alternating joint motions. For example: a single wrist deviation motion can be “split” by a finger motion in the opposite direction, potentially getting three notes.
So I gave up on three-motion looping tremolo, but watching the Pickslanting Primer again today, and remembering the section of the Yngwie seminar on his occasional finger motion–I think that’s exactly what he’s doing! I think I remember even hearing Troy say that he tends to use it in volcano-style arpeggio runs, and less so on single-string scalar playing, where he instead uses his dominant wrist primary. Which would make PERFECT sense if wrist-finger-wrist combo motion is limited to a three-note maximum sequence.
Is this something we have any science on yet? Still loving this site years later.

and what’s funny about it, is it really is that straightforward. Double stroke rolls were my Everest for a couple of years!