How to code an IIR Allpas filter for Analouge Phasing?

[philoop]

I don't know enough about IIR filters to actually make one. .

[SmashedTransistors]

You can get some theoretic explanations on JOS homepage:

https://ccrma.stanford.edu/~jos/pasp/Phasing_2nd_Order_Allpass_Filters.html