@d-healey It was the VST3 setting that was the problem. Now it appeared and worked as it should. Thanks to both of you for the incredible support. I appreciate it very much.

Can someone please show me a code example of sending a MIDI CC or NRPN message?
Message.sendToMidiOut() is probably what I need but I can not find a complete code example.

@d-healey It was the VST3 setting that was the problem. Now it appeared and worked as it should. Thanks to both of you for the incredible support. I appreciate it very much.

@Lindon Ok I see, where do I set VST3?

@d-healey Yes that is the path I used.

Library/Audio/Plug-ins/VST3/test1.vst

@d-healey From here...

...to VST3 Plug-In System Folders

@d-healey Do you mean this?

@d-healey First I followed this tutorial. https://www.youtube.com/watch?v=d-Vp9zEX1mg&t=115s

Then I selected the 'Export' menu in Hise. After that I selected 'Export as Instrument (VSTi / AUi) plugin'. Then I selected VSTi as the Export format and waited...

I got an error message saying this.

I do not really understand what that mean. Maybe that is the problem?

I just built my first VST in Hise. The problem is that a folder called Hart Instruments appears in Ableton Live. Underneath it is a VST called HISE but my VST is nowhere to be found. If I click on HISE, Hise application opens. What have I missed?

I wonder if Hise supports all MIDI messages, especially System Exclusive (Sysex)?

It is a must to be able to develop editors that control hardware.