Cubase 9.0 + Komplete Kontrol (NI) + External Synths

I would like to set up my HW-synths in Cubase as “External Instruments” and controlling the synths with KKmk1.
How do I d that?
I do the setup - but I dont trigger my HW-synths with KK. Nothing happens. I get audio signa in but no midi data to HW synths.

Anybody experienced setting up HW synts as “external Instruments” in Cubase and using KK as controller?? .