How to get spatializer min/max distance override in code (FMOD 2.02.03)

Unity
8

Apologies for the oversight there, you are right the non-linearity of the spatializer makes it impractical to use parameters effectively for this purpose.
In that case, I think a script might be the best way to go.
Here is a simple script for replacing the event macro min and max distances with the min and max distances on the spatializer in the master track. Run it before building and it should be a good workaround. Place it in your FMOD plugins directory and it should be a good starting point for you:

studio.menu.addMenuItem({ name: "Transfer Event Min Max",
    isEnabled: function() { var event = studio.window.browserCurrent(); return event && event.isOfExactType("Event"); },
    execute: function() {

        function transferSpatializerMinMaxValues(event)
        {
            var effects = event.masterTrack.mixerGroup.effectChain.effects;

            effects.forEach(function(effect) {
                if(effect.entity == "SpatialiserEffect") {
                    event.automatableProperties.minimumDistance = effect.minimumDistance;
                    event.automatableProperties.maximumDistance = effect.maximumDistance;
                    return;
                }
            });

        }

        var events = studio.project.model.Event.findInstances();
        events.forEach(function(event) {
            transferSpatializerMinMaxValues(event);
        });

    },
});

Then you can just read the min and max values from the event description as usual:

emitter = GetComponent<FMODUnity.StudioEventEmitter>();

var eventDescription = FMODUnity.RuntimeManager.GetEventDescription(emitter.EventReference);
eventDescription.getMinMaxDistance(out float min, out float max);
Debug.Log(String.Format("Min: {0}, Max: {1}", min, max));