Hi
check the bank changes in your midifile
your data list manual shows
Bank Select MSB 127 or 126 (on my psr1500)
Bank Select LSB 0 (on my psr1500 )
Program Change between 1 to 128 ( depending on the drumkit)

the above items should be present in your drum & percussion tracks.

As some mentioned Drums =10
Percussion= 9


best wishes
rikki

BIAB 2020
Yamaha sx900