How to stop an specific effect on specific fixtures

Hello,

I've been experimenting assigning macros to the bump buttons on our Ion for ease of use when busking live music. The idea is to assign a macro to start an effect on a certain group of fixtures on the top bump button and to turn that effect off using the lower bump button.

All is well creating a macro button to run the effect on a specific group via [Group] [Effect] [x] [Enter]

However, I cannot figure out the syntax to stop ONLY that effect, ONLY on that group of fixtures. [Group] [Effect] [Enter] and [Group] [StopEffect] stops all effects on those fixtures and [Effect] [x] [StopEffect] will stop that effect across all fixtures. 

Any and all variations of the above specifying the group and effect numbers I wish to target appear to come up with syntax errors.

Any ideas on how I can achieve what I'm aiming for?

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