Made with using Pure Data.

@whale-av Thank you so much!

@whale-av Thanks so much! 　
I want to control it with an audio signal, so I tried to make it with fexpr~.
Then I tried a few things and it worked! It seems that the spelling of fexpr~ was wrong!
Thanks a lot!

hello! This is my first time asking a question on the forum.Thank you!　I tried using fexpr~ to create a biquad~ filter, but it didn't work. . I don't know how to make a biquad filter using fexpr~.
Could you tell me if I'm wrong somewhere?
Only the low-pass filter worked, but the high-pass filter etc. did not work well. .
The image is a low pass filter.