Update on the issue: isMuted seems to function properly on first play of a track. In case I have isLoopingEnabled set to true and the track has reached and started a second loop isMuted does not work correctly anymore. I will continue to investigate if there are some loop/track settings that will help avoid the issue.

Hi! Thanks for the reply. Before I create a test project, I would like to inquiry, whether there an inbuilt method in AUv3 to select which node to send the midi data to? If it exists, could you point me to the documentation for it? Best, Miro

Hi again! I created the test project anyways. Here is a link to it. So basically, when pressing the Send Note button, the notes are being sent to all the connected nodes through the AUv3. The question is, how can I send the MIDI message to just one of the nodes connected to the AUv3?