Ending Effects

This is an old issue but something which still bugs me:

I'd like a quick way of ending an effect. Let's say you have an intensity effect running and send the lights to 50% this would cancel the effect.

There are times however where I'd expect the effect to use the values as a base so there needs to be a quick way of deciphering which is intended i.e. with a circle effect I may want the lights to go to my DSC focus and end the effect, or I may want them to circle around my DSC focus.

Thanks Ross
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