Hog 1000 effects

Hello

Quite new to the hog way of thinking.

I'm struggling with effects.

Essentially what I want to happen is to trigger an effect from a cue and then in the next cue that effect will stop.
I've read the manual which tells me to select the fixtures and then use knockout, which doesn't actually do anything?!
What am I doing wrong? I'm basically looking for an fx stop command.

Or am I just meant to select the fixtures and adjust the parameters to what I want in the next cue and that is the way to stop the effect?

Thanks in advance.
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