My Dear,
your answer impressed me, thanks a lot! You are right, maybe using the Interfaces by LAN MIDI might be the best way to use. A LAN switch been bought a little time before looking forward to use three Extender and the XTOUCH. Am happy, others use those massive Interfaces in their DAW, too! After a short troubleshooting my two „littles“ work, now for a while. Have done all the specs you told before, and it really works perfect.
Maybe there could be a better software integration in Cubase, in that case I have to program via Max a patch to personally the Interfaces to my workflow.
Sending love from Baltic Sea Coast,
Vivien