fluidsynth/doc/usage/creating_settings.txt

/*!

\page CreatingSettings Creating and changing the settings

Before you can use the synthesizer, you have to create a settings object. The
settings objects is used by many components of the FluidSynth library. It gives
a unified API to set the parameters of the audio drivers, the midi drivers, the
synthesizer, and so forth. A number of default settings are defined by the
current implementation.

All settings have a name that follows the "dotted-name" notation. For example,
\setting{synth_polyphony} refers to the number of voices (polyphony) allocated
by the synthesizer. The settings also have a type. There are currently three
types: strings, numbers (double floats), and integers. You can change the
values of a setting using the fluid_settings_setstr(), fluid_settings_setnum(),
and fluid_settings_setint() functions. For example:

\code
#include <fluidsynth.h>

int main(int argc, char** argv) 
{
    fluid_settings_t* settings = new_fluid_settings();
    fluid_settings_setint(settings, "synth.polyphony", 128);
    /* ... */
    delete_fluid_settings(settings);
    return 0;
}
\endcode

The API contains the functions to query the type, the current value, the
default value, the range and the "hints" of a setting. The range is the minimum
and maximum value of the setting. The hints gives additional information about
a setting. For example, whether a string represents a filename. Or whether a
number should be interpreted on a logarithmic scale. Check the settings.h
API documentation for a description of all functions.

*/