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AddMix is is great little node for editing mattes. By using its two curves it is possible to shrink and expand the matte of the foreground and also shrink and expand the background at the point at which it meets the mattes edge. This offers a lot of control over the edge of the composite.

Be warned: any edit to the edge of the matte that improves a particular part of the edge, is not guaranteed to look as good at every other part of the edge.