When I say "you cannot plug X into Y" I am not telling you that you will be physically stopped from making that connection. I'm saying it won't work. You cannot get the effect you want by doing that.

The Poser engineers made a bug there - the Volume input should only let you connect volumetric effect nodes, or Mixes or Adds that only carry volumetric effect nodes.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)