Add a new Probulator Function to the Probulator Functions rule:

The Denaturer
Output range: 0,1, 2, 3
Default forecast output: 1
Method: Return the forecast output. Select a number of Materials equal to the forecast output and set the forecast output for each of those materials to whatever value it had before the most recent time that it was changed as the result of being Used (materials that have never been Used can be selected but do not have their forecast values altered). Iterate the Forecast Output by 1; if that results in a value of 4 set it instead to 0.