To my knowledge when you talk about the plugin version of Ctrlr it does not matter if you have a multiclient capable midi interface. The DAW and the Ctrlr plugin won’t ever be able to use both the same port.
Yes they can – I’ve proved that. It works. It’s just that I can’t use MDM to name the ports. Again, this is using the Ctrlr plug-in – not as a separate ‘app’.
It’s simply that ‘output to host’ seems not to be able to get data out to Cubase.
An Eagle for an Emperor, A Kestrel for a Knave.