I'm trying to create a spinning light (e.g. a 'police siren light' that works in Augment3d. Can anyone help?

I have built a two channel fixture with a lamp and a motor-driven reflector that spins at variable speed depending on the dmx value received, to simulate an old-timey 'police light' the kind that spins (think warning beacon in a nuclear power plant). It takes a value for intensity and a value for rotation speed. (see attached image for the type of fixture I'm talking about).

I have managed to create a custom moving head light that pans and tilts and that all works in Augment3d. But I don't need the fixture to pan or tilt. I need it to 'spin' continuously at a rate of speed determined by DMX. I thought Z rotation speed would do the trick, but that achieves no visible results in Augment3d... Does anyone have any thoughts?

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