I saw this tutorial
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.