So the first step to control Synth with an external midi controller is: Go to the Main Menu, press Synths, and turn Local Mode to Off for all three engines. This is the same screen where you set the number of voices per engine. My first question is…. In order to save a change to the number of voices for the currently edited scene you must Save. But changing the Local Mode to Off will affect all Scenes even if you don’t save the edited scene. So changing Voices is scene specific and only if you save the scene. Whereas changing Local Mode applies to all scenes whether you save it or not. Maybe it’s not possible to have different Local Mode settings per scene but then why make this setting at a Scene level edit?
Sounds like an oversight to me. I agree it would make sense if this was stored on a scene level.
Precautiously you could create a feature request for it 
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