Set the wet output of a previous block as the input for another block later in chain. For instance maybe I want to not only stack two reverbs, but I only want the wet signal from the first reverb to feed the second reverb.
Or I want a drive block after a pitch block, but I only want to apply the drive to the pitch shifted part of the signal from the previous block.
It would be really cool if you could mix the wet output from several previous blocks.