i have noticed IK-multimedia T-racks Plugins are not registered in MC history list.
as far as i know they are not VST3 unfortunately, but it should work anyway ?
Items that appear in the History are those parameters that are exposed to Cubase as Automation parameters. T-Racks does not automatically assign the automation parameters of the individual modules to its host automation, so they are not exposed to Cubase.
I guess you are right. I remember I had trouble controlling theirs amplitube 3 with automating parameters…! Why they want to hide parameters from a Daw?