Hi , saw the clip a week or so  ago.  I donβt  have a clue what he was talking about as far as Ketron sound goes.  Tried changing the style extension  to .mid, that did work, but I couldnβt change it back after editing . ( Sokratis on psr forum post , said not necessary, it can load as .mid , if I understood him correctly.)  
The guy is making some pretty big claims, and as far as I could tell, doesnβt have access to one at time of making video.
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Rikki  π§Έ
Korg PA5X 88 note
SX900
 Band in a Box 2022