Midi device manager

I have several devices definitions installed in Device Manager (over 15 devices).
When I start with a proyect I use several synths (but not all).
Every time I start Cubase without ALL the synths powered on before cubase started, I loose the link between the Device Definition in manager and the midi out connected to it.

It’s possible to make One only time the link Device and Midi Output for every time (being powered or not my hardware synths?)