Hello:
I have compiled a standalone C program using libfluidsynth 1.1.6. This
program is running on a small Intel Atom motherboard with Ubuntu server
12.04LTS. Using a M-Audio standard USB-to-MIDI adapter, I interface to this
motherboard to a standard Yamaha MIDI keyboard which also has a sustain
pedal. The MIDI device (port 20) is connected to the fluidsynth server
(port 128) using the command "aconnect 20:0 128:0". Once done, I can play
on the MIDI keyboard and hear sounds from the application synthesized by
fluidsynth. Everything works very well except for one problem. The
behaviour of the sustain pedal doesn't appear to work correctly. If I let
go of the sustain pedal and strike a key, the sound fades quickly (as
expected). However, if I hold down the sustain pedal and strike a key, the
sound does NOT fade any slower. It fact, it fades exactly as quickly as
when the sustain pedal is released. It seems like the pedal has no effect.
I have checked and can confirm that the sustain pedal is sending midi
message 176-64-127 (when on) and 176-64-0 (when off). I am also using the
standard Fluid R3 GM MIDI soundfont.
In order to eliminate some variables, I ran a completely separate test.
This time, instead of using my compile C program, I simply ran the
fluidsynth server as a command-line utility:
>jackd -R -t2500 -P81 -dalsa -p128 -n3 -r44100
>fluidsynth -s -a jack -j -g0.2 -i -r 44100 -o synth.polyphony=64
/usr/share/sounds/sf2/FluidR3_GM.sf2
>aconnect 20:0 128:0
When I do that and connect the MIDI output, it actually WORKS exactly as
expected! When I hold down the pedal, the notes take longer to fade. This
confirms that fluidsynth is able to respond to the signal and the the midi
sustain pedal is sending the correct MIDI message across. The remaining
question is what is different about my C program using the libfluidsynth
library that would prevent the sustain function from working? I am not
doing anything special and most of the settings are kept as defaults. I
checked all the command-line options of the command line fluidsynth utility
and have all the same values selected in my program. Any ideas why the
default behaviour is different? See code snippet below.
Secondly, in the fluidsynth API I cannot find any message that allows me to
enable or disable sustain function. The only references to sustain are the
"overflow" settings below. What is the proper fluidsynth API function call
used to enable and disable sustain?
Thanks for your help!
Here is a snippet of code of how I initialize the synth in my program:
synth_t *new_synth(int argc, char **argv)
{
synth_t* synth_ptr = NULL;
// Temporary variables
int err = 0, i;
// Allocate mem for synth structure
synth_ptr = (synth_t *) malloc(sizeof(synth_t));
// On error, return immediately
if (synth_ptr == NULL) return (NULL);
// Allocate fluidsynth settings
synth_ptr->settings = new_fluid_settings();
if (synth_ptr->settings == NULL)
// On allocation error
{
err++;
// Increment err
goto synth_cleanup;
// Jump to cleanup
}
else
// If allocation successful, set
{
// desired parameters in settings
// structure. Polyphony = 64 prevents
// system crash and distortion due to
// limited Intel Atom processing power.
// The synth assumes that the JACK
// server is already running.
// 44.1kHz sample rate. Default
// fluidsynth gain is nominally 0.2
fluid_settings_setint(synth_ptr->settings,
"synth.polyphony", 64);
fluid_settings_setint(synth_ptr->settings,
"synth.chorus.active", 1);
fluid_settings_setint(synth_ptr->settings,
"synth.reverb.active", 1);
// The following values are simply experiments to try and get the sustain
pedal to work. No success yet.
// fluid_settings_setnum(synth_ptr->settings,
"synth.overflow.age", 1000.0);
// fluid_settings_setnum(synth_ptr->settings,
"synth.overflow.percussion", 4000.0);
// fluid_settings_setnum(synth_ptr->settings,
"synth.overflow.released", -2000.0);
// fluid_settings_setnum(synth_ptr->settings,
"synth.overflow.sustained", -1000.0);
// fluid_settings_setnum(synth_ptr->settings,
"synth.overflow.volume", 500.0);
fluid_settings_setnum(synth_ptr->settings,
"synth.sample-rate", 44100.0);
fluid_settings_setint(synth_ptr->settings,
"audio.jack.autoconnect", 1);
fluid_settings_setnum(synth_ptr->settings,
"synth.gain", DEFAULT_SYNTH_GAIN);
}
Regards,
EG
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