Footswitch on Mackie ProFX mixer

I recently acquired a Mackie ProFX mixer which has a footswitch jack. Per the manual, you can use it to turn the internal effects on or off. However, I'm unsure what type of footswitch would work with it. Any input appreciated.
 
I recently acquired a Mackie ProFX mixer which has a footswitch jack. Per the manual, you can use it to turn the internal effects on or off. However, I'm unsure what type of footswitch would work with it. Any input appreciated.
Any simple TRS, on-off footswitch will work. Momentary footswitches will work also but to be safe it would need to be one with a polarity selector.
 
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