Well, there is the ARC-Action Recorder Controller. I never understood the functionality of the AVC. It controls the amount of juice given to accessories, but they are all at the same setting. It seems I did the same thing without an AVC, using the variable outputs available on an AMC. It is the only controller box I haven't used.
I guess if you are using Ross switches with DZ 2500 machines, that would count as well.