FluidSynth
Did anybody look at FluidSynth sf2 player?
sf2/sfz playback is also about the accuracy of the sampler based parameters (tuning, envelopes, velocity split points, reverb+chorus and others).
FluidSynth is known for its superior accuracy, GPL, has a gtk GUI app, an sf2 editor (swami) and has been integrated as native plug-in in the muse sequencer. There is no port to vst or lv2 as far as I know.
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