Hi there
I saw this tutorial

http://puredata.hurleur.com/sujet-7001-building-filters-difference-equations-using-raw-filters

but i can't still understand how to build filters using raw filters. That's because my english is very poor . So i'm searching for some examples in pd, for example i'm interesting how to build simple low pass filter like lop~ using raw filters. Also i tried to figure out what pole and zero means. I've tried to investigate how biquad.mmb~ works but it's very difficult. So if someone show me simple examples in pd, it will be cool.

Any helps apreciated. Thanks.

mmb gives away his library as a signature to all his post in this forum. I guess you already have it since you have [biquad.mmb~]. check the help file of [filtercoeff.mmb~], it shows how to create coefficients for any kind of filter you want.

Thank you