Thank you guys. When I decide to do this work I will use three separate contacts activated by one pedal, just as I suspected would be the safest way.
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Victor

Korg Pa3x 61 - Mediastation X76 - Yamaha Psr s900 - Korg Tr61 - Roland PK5A - NanoKontrol - Ensoniq SQ1 - Yamaha D85 organ