Random pitch shifting. Adjustable frequency of deviations, max deviation amplitude, some version of attack, and length of deviations.
The patch started out as Basic Analog. Please tell me if something’s wrong.
I was trying to simulate Fairfield Circuitry’s Shallow Water pedal because Knobs’ video was beautiful. This is not that, but it’s something.

Hi Liam
I emulated the Fairfield Circuitry Shallow Water this summer for my Patreon patrons
https://www.dropbox.com/s/gsx4t39sd02tu27/HEAVYWATER.zip?dl=0
this is pretty close to the exact spec that they use.
enjoy
Patrick