Thanks Tom:

I printed the wikipeda to study, that will help a lot
What I was thinking was that the IIR would be less likely to be used than
the default low pass filter by an organ fonts;.  From what you said that
may not be true

Thank you for your help *fg*

On Wed, May 22, 2024 at 2:13 PM Tom M. <tom.m...@googlemail.com> wrote:

> Every SF2 compliant synthesizer has a low pass filter in place. To use
> that, open a SF2 editor, select an instrument and specify filter
> cutoff frequency and filter Q.
>
> To automate this via MIDI events, you should learn about Soundfont
> modulators, and how they influence the values that you have entered in
> the previous step. Then, by using the SF2 editor, set up a modulator
> for that / those instrument(s) that you would like to control.
>
> To avoid copy&pasting the same modulators to all instruments and all
> soundfonts, you can use fluid_synth_add_default_mod() to set up a
> default modulator. This is fluidsynth-specific and not portable to
> other SF2 synths, though.
>
> Alternatively, you can use MIDI NRPNs to manipulate the filter cutoff
> freq. and Q.
>
> fluid_synth_set_custom_filter() is intended for advanced use-cases and
> most likely not what you want or need.
>
> An int is an integer, refer to
> https://en.wikipedia.org/wiki/Integer_(computer_science)
>
> Tom
>
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