@oid Nice, i'll give it a try and try to see the flaws on my patch, thank you!

@oid Nice!

I noticed that there is no .PD file, only .py.

Does it need any python coding to use? I really don't know any programming language besides pure data.

Hey David, thanks for your answer.

I usually don't use externals, mainly because I use mobmuplat a lot, and it Doesn't run externals.

I already used SCF~ (I think this is the name), a really good filter from cyclone. But now I'm trying to learn how to develop Filters myself so I can run them in PD vanilla and mobmuplat.

Hello, this is my first post on the forum.

I'm trying to create a high pass filter with Q using Biquad~.

As I don't have enough mathematical knowledge about filters and coefficients, I asked Chat GPT to help me understand the math, and I think I almost got it now.

The problem is that I'm executing everything it said me to, and I think the equations are correct, but it is not working properly, I get a kind of filter, but for sure it is not a high pass, and the Q always starts around 2000 Hz and I don't know why.

Can anybody please help me to understand what is going wrong?
I have some experience with Pd, but not with math or DSP.biquad_test_filter.pd