[PD] how do you use biquad~ ?

[Thomas Goepfer]

How can you use biquad without a filtergraph ?
How do you set (calcul) the 5 parameters ?

In the web, the only doc is http://www.harmony-central.com/Computer/Programming/Audio-EQ-Cookbook.txt, but it is the not the same biquad in pd... and the operations are false for pd...
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