I'd like to know what you are building and why nodes need to be blanked out. Why can't you just cut nodes off? Or just wrap electrical tape around them.
+1 on what Gil is suggesting.
One side effect of blanking on the controller is that any effects in xlights will still utilize the nodes, they just won't "blink". So depending on the prop this might be noticeable if you are doing chases, for example. Take the time to do it right.
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