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Old 09-01-2019, 04:50 AM   #11
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Join Date: Jun 2013
Location: Krefeld, Germany
Posts: 8,648

Just some thoughts:

The program change message is special in that it only need two midi bytes instead of three. AFAIK, the receiver is supposed to ignore the third byte if it comes in but should act already on the second.
ReaCpontrolMidi shows three bytes, but I don't know how many are sent to the piugin.

Are the plugins that don't work VST3 ?

It is known that the Midi input specification for VST3 has been changed during the last year, and there can be incompatibilities.

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