Instrument mapping is historically aggregated by MIDI channel and output bus, so that you cannot have different instrument patch settings addressed via bank+program numbers) for the same channel and bus. Maybe it's your trouble. Try using a distinct MIDI channels for each of those tracks/fluidsynth-dssi instances.
Instrument mapping is historically aggregated by MIDI channel and output bus, so that you cannot have different instrument patch settings addressed via bank+program numbers) for the same channel and bus. Maybe it's your trouble. Try using a distinct MIDI channels for each of those tracks/fluidsynth-dssi instances.
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Cheers