Make a checkbox in Preferences to turn off deleting channels on delete button press.
To delete a channel, use the gui at the bottom of the channel list.
Delete button should still work for other things.
You have to wonder why no one else comes across this. Is it just me? Or It takes time and effort to post a 'how to duplicate' a problem. Let alone a video. I go back and forth between VSL and the expression map editor in Cubase like ping-pong. It happens to me many times, enough to push me to make a video.
8 years huh? To be fair, I should have posted this a year ago or more. So it really should only be 7.
I had a question to another plugin. ilya efimove responded
Thank you for being our customer and sorry for the delay in reply. It's
really great that you studied the manual so thoroughly, because you have
found mistypes nobody ever noticed since all these years the Duduk has
been released.