https://www.facebook.com/groups/KetronSD90/?ref=group_header Greg V-Accordion :
"Make sure your Rx sysex tab is not yellow in your midi Settings"
Transpose Up:
F0 26 7C 05 01 1A 7F F7
F0 26 7C 05 01 1A 00 F7
Transpose Down:
F0 26 7C 05 01 19 7F F7
F0 26 7C 05 01 19 00 F7
Many thanks