[PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

[Alexandre Torres Porres]

Hi there. So, I've been studying a lot about filters, and I'm doing this
clone of max's z-plane in Pd.

I hope anyone can help me guide where to find how to convert the values of
the complex poles and zeros to biquad coefficients. I really needed that...

Sorry if I missed it in Miller's book or some other obvious reference, I'm
just really a newbie in filter design.

Thanks
Alex
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