hey there - not sure if this will help . it's from CCRMA's site referring to a C based version of a biquad filter, but i imagine that functionally it shouldn't be too far off:

https://ccrma.stanford.edu/~jorgeh/projects/ass/ASStk/doc/com/australsounds/Filter/BiQuad.html

maybe this will help a bit?

best,
scott

On Sun, Sep 28, 2014 at 6:48 PM, Фывапр Олджэвич <tofuckof@inbox.ru> wrote:
Dear List !

Can anyone help me with the understanding of [biquad~] filter ? No tutorials , no explanations found. The help file has very little info. 

What do coefficients mean ? 

Thanks. 

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