I'm drawing a blank on what Fagen's playing on that DVD(guess I'll have to break it out)...I do recall seeing Chick Corea use a 'synth controller' with a 'neck' on some VHS I had of an early '90s Jacksonville Jazz Fest.
I think I also recall seeing Nathan East use something similar on an Al Jarreau '80s concert tape.
Goin' back to the '70s-
...then there's Edgar Winter strapping on a full-sized keyboard(ARP 2600?) in order to 'get out front'. Check him out on the
Old Grey Whistle DVD doing "Frankenstein" with Derringer, Hartman, & Ruff.
I would revisit this DVD but it's out-on-borrow.
