Ooof. I had been going a bit bonzoos. Earl, the one and only maintainer of the RP2040/2350 arduino sdk saved my but.
In short, to run #MutableInstruments #Rings on the 2350, you need overclock to 276 mHz. This was not possible till the recent 4.6 update. Rings and Plaits on MMM short video, first rings then a brief switch to plaits and back. It's pretty. Meta Mutable Module from sluisbrinke and poetaster's tonetoys.