In the macos system, tools that are native to this system from origin are not able to work correctly.
I have written many times to fix this bug.
I don’t understand at all how you can work when the fundamental functions do not work as they should.
A couple of not careful movements and the synthesizer hangs. And there are many of them among the AUIs.
This is the only program in which I observe this behavior of synthesizers.
https://yadi.sk/i/xB3xj2KVlDPLXQ
Different synthesizers behave differently, but they have something in common.
Maybe the video will give you an idea.
The midi file on the video is simply written with the mouse and does not contain any controllers.
https://yadi.sk/i/We6JrpfeeL6LcA
Settings, maybe something is wrong.
Sorry for google translation.