Alpha Forever - Filter 4p RC Modulated node
A new feature of Alpha Forever in the second update of 2021 is the 'Filter 4p RC’ node.
"The 4p RC Modulated node is a multimode 4 pole ladder filter, where you can control the resonance depending on the cutoff frequency using the ‘Resonance Correction’ function.
The effect can only be observed when using resonance, and the filter’s cutoff is modulated."