I don’t have the Mega Duck but the Ducking module from Juanito Moore.
in mine you can use the kick signal, or what ever trigger, gate, cv or audio as signal
generaly i’m multiplying the audio kick for that
I think that the Mega Duck is only switch (because relay)
i can increase or decrease the effect of ducking with the Juanito Moore one i build
it’s really 2 differents thing infact
@TylerTheFolf here a short demo of a ducking module, more explicite to understand the effect