[PD] filtercoeff~ / filtergraph~ in Pd?

[Alexandre Torres Porres]

Hi there, now that someone gave me a Max license and I'm translating some
patches to Pd, I guess I'm gonna start bugging you guys a lot asking for
equivalent objects in Pd ;)

And here I ask about [filtercoeff~] and [filtergraph~]...

Based on filtergraph~, filtercoef~ calculates filter coefficient for the
biquad~ object from frequency, amp & Q.

They seem to make it really easier and friendlier to use the [biquad~]
object. Maybe this could be worked out as some abstraction, maybe someone
already has. The math just blows me away and I have completely no idea
whatsoever...

Cheers
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