I intend to string together twelve DMX luminaires and adjust them individually. I could use a DMX controller, but the site already has CASAMBI installed. Would I need one casDMX unit per fixture? Or can I use one casDMX for all 12 of them?
You will need one casDMX for each 4 channels, if one fixture needs 4 channels then you would need one per fixture. Casambi is really a 4-channel ecosystem with their widgets, so that is th elimit.
You can get more from the casDMX, but then you are limited to using sliders and no widgets.