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 _______________________________________________ fluid-dev mailing list fluid-dev@nongnu.org https://lists.nongnu.org/mailman/listinfo/fluid-dev
