The soundfont spec defines a default modulator for CC1. That means a value of 127 will result in a vibrato effect of +-50cents (not to be confused with tremolo).
This default modulator is implemented in fluidsynth, see this chart: https://github.com/FluidSynth/fluidsynth/wiki/FluidFeatures I've just verified its correct behaviour using fluidsynth 2.1.3. If the effect does not work for you, that default modulator may have been overridden by the soundfont you are using. It may also be that the delayVibLFO and freqVibLFO initial generators have been modified to cancel out any vibrato effect for whatever instrument you've tested with. You'll need to check that with a soundfont editor. Tom _______________________________________________ fluid-dev mailing list fluid-dev@nongnu.org https://lists.nongnu.org/mailman/listinfo/fluid-dev