[Rey_a]

In my experience you cannot choose which midi connector to use for in and out. One is the IN the other is the OUT. If you connect them otherwise it will not work. But as said, thats in my experience with midi.

If you consistently get good results in 'usb midi monitor' when sending commands to the tablet, then it feels logical to me, to think that the cable is ok and that it is the config in MSPro or MSPro itself that is not ok.
I use MSPro to load sheets based on midi commands myself, so on my tablet at least MSPro is ok with that.
I would at this stage play around with the midi offset (also in the midi channel) Meaning that if you currently send a 5, try sending a 4 and if no result, then trying a 6.

What command is configured in MSPro? 'Patch select', 'program change' ... I use 'patch select' I cannot remember if I tested with any of the other commands ...