Maybe this would work:

https://www.ebay.com/itm/Rare-Korg-FC6-Foot-Controller-w-5-Pin-Cable-For-Parts-Repair/323286976870?hash=item4b4567c966:g:pIEAAOSwbE9a7Rb3
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)