I'm studying a distortion add to my multifaceted BNR, and I'd like a way to introduce distortion as an effect right before final compression.  To do that I have to be able to turn it off and on via MIDI automation.  What kinds of MIDI signals do I need to send to Calf Saturator and LittleFly, in order to turn them off and on on the fly?  I'll probably be sending them via mididings unless I need to find a different method.