Audio Damage Automaton - Manual (Page 20)

The DUCK mode silences the input signal when it is playing back looped audio, and passes the input signal
without alteration otherwise. This mode is useful when you’re using Automaton as an insert effect, and you
want to hear the original signal and the processed signal but not both at once.
The SEND mode does not pass any of the unprocessed input signal to Automaton’s output. You hear only the
looped audio. This mode is useful when you’re using Automaton as a send effect in your host’s mixer, sending
one or more channels to it and mixing its output with the other signals.
These mixing modes have less obvious but interesting uses. For example, you can create a rhythmic gating
effect by using the Send mode while Automaton is used as an insert effect.