Ok, this is as far as my knowledge go's, so if I am wrong let some one corect me.

As far as I know, with transparency FireFly say's, its still there but you can see throu it.
When its still there, it hase a edge and drops shadows.

With a transmap FireFly say's, It is not there, what is not there it can not be rendered.

But again, this is all I know.
Maybe you can do something with nodes, I leave that to others.

I am not a complete idiot, some parts are missing :)

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