You're looking for MatPoseEdit.

I can see it on my old backup CD's but there's no readme and I can't remember who made it. With luck, it may still be available in the Free Stuff here :o)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.