Here is the answer from Yamaha.
"The Performance Assistant only works with Song data in the K1. The
incoming MIDI data stream is not Song data as far as the K1 is
concerned. Bottom line: it doesn't work. Sorry."
George Kaye
Kaye's Music Scene
Reseda, California
_________________________
George Kaye
Kaye's Music Scene (Closed after 51 years)
West Hills, California
(Retired 2021)