Well, its working quite ok now, except for a few things.
First, when I play the keyboard I have two instances of a sound, the piano sound and that is over the entire keyboard.
However, if I change the sound the other sound some times change and some times not, but the split seems to be ok.
I have set the RX 1 uper to channel 1 and lower to channel 2 and nothing else.
It's only the sound issue I am having.
Many thanks for any help!