Virtual Intensity for LED Fixtures

My friend told me of a way he added a virtual "intensity" attribute to his ColorBlasts using the Hog 3. Is there a way to do so on the Hog 1000. I want to patch my LEDs using the standard 3 channels but be able to control the overall intensity with a "virtual" attribute for use in blackouts and other such uses. Is this possible??? :06:
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