694c5fcfa66b6c78bfc46ff9ac8b634b8ffdc05f
Some plugins return 0 from effGetVstVersion and are hence not detected as instruments. e.g. VeeSeeVSTRack (VCV). This may also explain why MIDI port of some other VSTs are not exposed. Most VST2.4 return 2400, so checking [effGetVstVersion] >=2 (and not 2000) was incorrect to begin with.
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