[Pete]

Ok, so I delete one MIDI message:

When there is only ONE Midimessage, in this case channel 1 for the BeatBuddy, there is no reation, no matter how often i try.
When there is only ONE message to channel 2 for the GT-1000 then there is a reaction. But: every second reaction
 causes the correct preset, and the next causes the Basis preset (1-1).

But I tested some other things. I created a smart button with a Midicommand to the BeatBuddy on channel 1.
For example the command: "increase the tempo by four bpm".  By testing this command only every second time is a reaction. For example the bpm increases from 120 to 124.
1. time: plus 4
2. time: no reaction
3. time: plus 4
and so on

Here the screenshots
       

And here from MIDIOX. Every click  on the smartbutton causes a new line in MIDIOX. You see eight clicks on the button
   

By the way. with the other tablet (or mobile) it all works correctly.

Have you ever tested your programm with Tablet Samsung Tab A8 ( SM-X200 )?

It is to despair

Thanks for help
Pete