vst~ Outputs Doubled Midi Notes With VST3 plugins

ivicam's icon

Documentation for vst~ states the following:

"Out fourth-from-right outlet: Raw MIDI bytes received by the plug-in (but not any MIDI messages received using the midievent message)"

And this works as expected with VST2 plugins. However, VST3 versions of the same plugins (tested with Komplete Kontrol and Arturia Pigments) output both the input midi notes and midi notes generated by the plugins. Is this a known issue?