Dudette actually
You're welcome.
Incidentally if you are using actual external MIDI devices as well and need to leave that box checked, the workaround is to use instrument tracks for any MIDI routed internally and MIDI tracks for external. You can still use the same workflow of having several tracks routed to a single instrument plugin, you just route them using the instrument section of the track header rather than the IO section. And if you're using an TDM system, turning the physical output of 'dummy' instrument tracks off will prevent them from using up unnecessary voices.