RGB LED effect triggering

Hi Guys

I am using simhub on my custom racing arcade cab for a few years to good effect. One of the many things I do with it is have LED effects that run around the whole cab to look pretty... when a compatible game runs they switch into rev mode.

what would the easiest way to make them dim when an unsupported game is run? I want to stop the pattern running and being a distraction when running teknoparrot or similar.

Thanks for any help.

Trev