Now my idea...
A "shadow plugin" option in rack slots... means the plugin is loaded twice. During a transition the active plugin can sustain the current sound while the new sound is loaded in the shadow plugin and midi flow is toggled there. Each change will automatically toggle plugins again, resulting in hassle free sustain phase over transitions.
I am aware that loading a plugin twice doubles computation need... but trying to get the same transition behavior with the options available is no different...
