Hi Jim and meyrick,
The post I referred to comes up on page 7 on my tablet but it is still on the forum. I agree there is not much of help from me, but other members wrote on set-ups at the beginning of the thread.
There is one other way, and that is using "split voices" available from Organaut UK and others, but this does NOT split the keyboard the way you want, and the voices cannot be changed easily, if at all. Also, I think, it might be possible in YEM to create your own split voices but I have not tried it so far.
Robert.