ok, I am getting close to remotely control parameters for the PSR-S910 via Mobilesheets when playing live.
Parameters that need to be controlled:
1) Style choice,
2) Section control,
3) Tempo,
4) Style volumes of each part, not for Mobilesheets, but Xtouch controller
5) Transpose
All except the Transpose function are working, thanks to the help provided by members of this board.

Been struggling with transpose for hours over a few days, and not getting anywhere. So I must ask for help again.
Looking through the manual there seems to 7 methods to change the tuning by semitones.
Via Midi Message
1st Method: using Control Change RPN Coarse Tune Messages via Midi, (per one channel at a time)
2nd Method: from MIDI Parameter Change table (XG SYSTEM), Transpose function
3rd Method: MIDI Parameter Change table (MULTI PART Note shift)
Via Sysex
4th Method: Master coarse tuning [GM2]
5th Method: Controller (Control Change) [GM2], per midi channel
6th Method: XG Parameter Changes, Transpose function (see method 2)
7th Method: MIDI Master Tuning
There may other commands that need to be sent for these to work, IDK.
So which is the best method to use, and how to use it?
Sincerely,
Dan