It’s working fine with “Find Midi devices” > I see input and output. Input is working fine. I don’t get any result with “Find All Midi devices”
The error message is : “Blueprint Runtime Error: “Accessed None trying to read property MidiOutput”. Blueprint: BP_MIDI Function: Execute Ubergraph BP MIDI Graph: EventGraph Node: Send MIDIControl Change”
I don’t have a real midi controler but a stream deck using loopmidi software to open port. You can see an example at this address : 24- Utiliser un Stream Deck avec Unreal Engine - YouTube
Thanks for your answer