You can set up a modulator in the SoundFont to route a MIDI CC to the
mod LFO volume, which will create a tremolo effect. However, as with the
vibrato, this effect is aligned independently with the start of each
note, which is not usually the effect you want for an organ, where a
single tremolo effect should modulate all notes simultaneously.
Have you considered adding a tremolo effect plugin to the audio chain
after FluidSynth?
-~Chris
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