If you just want to see the freq/phase response, check [else/biplot], an abstraction that plots biquad coefficients (also more than one biquad filter in cascade). Use it with [else/bicoeff] that generates the coefficients for many different filters - all of which are also present as dedicated objects that also take signals to set frequency/resonance, like else/bandpass~ (so you can use them and then bicoeff/biplot just for visualization).

The biplot is actually an abstraction and you can build your own to plot from difference equations/transfer functions. The ELSE library comes with a tutorial that explains lots of computer music theory, including this filter theory (see chapter 31). For reference, see https://github.com/porres/pd-else/releases but you can also get it directly from Pd (aka deken).

cheers

Em sáb., 12 de set. de 2020 às 06:55, Jean-Marie Adrien < jm.adrien.mnt@gmail.com> escreveu:

Hello List Just to know : is there somewhere a good package / object for sound filtering with a sort of graphical interface showing the transfer function a bit like what is available in the Logic pro channel EQ, (a bunch of filters with frequency center, Q and dB sort of and resulting transfer function against freq) ? Thanking ! Jm

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