First documented single stroke roll using Open/Close (Push/Pull) technique . Ed Shaughnessy said "You've developed an historically important form of technique that ranks with the Moeller System!" His endorsement created an invitation from PAS to do a clinic series with Joe Morello and Jim Chapin at PASIC 2003 - https://www.gk-music.com/wp-content/uploads/2016/08/Chapin-Morello-Knudtson.pdf
After my presentation Joe told me "I'm SO glad you did this! Billy Gladstone was messing around with this when I was studying with him, but he never documented it....I think you took it further than he did!"
The SINGLED FOUR single stroke roll synchronization was first published in Percussive Notes Magazine in April 1999 - "A New Approach to the Single Stroke Roll" - https://www.gk-music.com/wp-content/uploads/2017/10/A-New-Approach-to-the-Single-Stroke-Roll.pdf
Go to GK-Music.com for Skype lessons, and method books by Gordy Knudtson.