Re: [fluid-dev] Help with setting volume control

[scott andrew franco]

So running a program to research the issue:

 

/* show the device fluidsynth connects to (usually "default") */
r = fluid_settings_copystr(settings, "audio.alsa.device", buff, 200);
printf("r: %d\n", r);
printf("The alsa PCM device for Fluidsynth is: %s\n", buff);

r = fluid_settings_copystr(settings, "synth.gain", buff, 200);
printf("r: %d\n", r);
printf("The gain for Fluidsynth is: %s\n", buff);

r = fluid_settings_setstr(settings, "synth.gain", "10");
printf("r: %d\n", r);

r = fluid_settings_copystr(settings, "synth.gain", buff, 200);
printf("r: %d\n", r);
printf("The gain for Fluidsynth is: %s\n", buff);

r = fluid_settings_copystr(settings, "nonsense", buff, 200);
printf("r: %d\n", r);
printf("The gain for Fluidsynth is: %s\n", buff);

 

Result:

 

./test
fluidsynth: warning: Failed to set thread to high priority
fluidsynth: warning: Failed to pin the sample data to RAM; swapping is possible.
r: 1
The alsa PCM device for Fluidsynth is: default
r: 0
The gain for Fluidsynth is:
r: 0
r: 0
The gain for Fluidsynth is:
r: 0
The gain for Fluidsynth is:

 

So "synth.gain" does not appear to exist. I got this name from:

http://www.fluidsynth.org/api/fluidsettings.xml

?

 

--------- Original Message ---------

Subject: [fluid-dev] Help with setting volume control
From: "scott andrew franco" <address@hidden>
Date: 7/30/19 6:58 pm
To: address@hidden

Hi,

 

I am using Fluidsynth library in my program (Petit_ami on sourceforge). It is working well, but

my result is very low volume output.

 

A search found many other references to low volume, and the standard answer I found was to turn up

the gain on the command line version of fluidsynth (I believe -g or "gain" option). Of course that does not

apply to users of fluidsynth as a library.

 

I have had good luck finding various parameters via the settings call. The

"synth.gain" parameter should do it:

 

"The gain is applied to the final or master output of the synthesizer. It is set to a low value by default to avoid the saturation of the output when many notes are played."

 

It is 0-10, but is defaulted to 0.2.

 

However, changing this parameter had no effect on the output volume, I tried all the way up to 10.

 

Other details: I am using alsa device. The device it is using (by examining "audio.alsa.device") shows as "default".

 

Any help appreciated.

 

Scott A. Franco

San Jose, CA

 

 

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