[PD] Notch filter

[yvan volochine]

Hello all !
I'd like to make a 2pole notch filter.
I found a few topics about notch filters on this list but I didn't
understand everything.
I read that I could make one with biquad~ but this object is somehow obscure
to me.
I don't know how to deal with the 5 parameters. In maxmsp, you have the
filtergraph~ object which "translates" your Freq, Q and so on for use with
biquad~ but in pd I just don't get it... The filtergraph pd objects are also
difficult for me to understand.
Could someone explain me how I can make a notch with biquad~ (or with any
other native pd objects) please ?
Thanks.

_y
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