Dynamic Effects on devices with "virtual intensities"

If I've got some cheap LED pars in part of a set that are basically three channels RGB thats I've set each attribute to "fade with intensity" all is well except.... If I try to run a dynamic effect that works on intensity (like sparkle) it will work on any other device in that group (generics movers etc with a real intensity channel), but not the cheapy LED pars. Am I doing something wrong or is this a limitation of the system?

Thanks,

Richard

 

 

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