Need help with a specific effect

Several fixtures need to have several intensity values.

Those Values are set by a submaster (relatively to each other).

An effect should run that fade the fixtures 30% down in relation to their current background value, set by the submaster.

I tried to use an absolute effect, but i can only use absolute (hence the name... ;) intensity values vs the background value. I would Need a @-30 in the value tab...

But even the effect with absolute values vs the Background value didn´t work when using a submaster to set the Background value. It simply didn´t recognize the intensity values set by the Sub as Background Levels. It uses Background 0 instead.

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