I was originally a bassist for 2 years before I played guitar, and I was a huge fan of Victor Wooten and other bassists like him. I was obsessed with his famous double-thumbing technique.
If you don’t know, double-thumbing is a slap bass technique where the thumb travels through the string (rather than bouncing off, like most slap techniques). The thumb is then pulled back up through the string, basically allowing for a Downstroke/Upstroke system, but with a slap-bass sound. It’s used by a lot of guitarists like Tosin Abasi these days, but it originated on the bass.
When I picked up the guitar, Zakk Wylde’s Elbow/Shoulder tremolo picking technique is actually something I naturally adopted pretty quickly. It just felt like a really comfortable motion (and still does today). I was thinking about it recently while playing bass, and I realized I got the basic motion from trying to copy Victor Wooten’s double-thumbing technique.
Demo here -
During the slow part of the demo he’s definitely using rotation, but when he actually plays, it very much looks like a straight “punching down” sort of motion.
Also, the motion on bass will naturally require a USX angle - because you need to add in “pops” with your other fingers, and those require an upwards motion. So, by having the arm motion already providing that upwards angle, the pops happen almost automatically.
This clip of him playing with Cory Wong shows the motion from the side:
Thoughts? I’m guessing that this motion, while relatively uncommon on the guitar, is actually fairly common among bassists who attempt this style of slap bass.