This is the block schematics from the operation manual. But I does not make sense too me. Look at the arrow from vca. It might be a typo. But then all arrows are wrong. The shaping EQ is supposed to be in the sidechain.

It all vca arrows are shifted it make little more sense. But the saturate->external-sidechain is in "right" order. It would make sense that the compressor controls the VCA, but then saturate block does not make sense.