Hi NiCad
Yes, you can split the kb, using Multi mode. On p81 of the reference manual you will find the Multi mode parameters Low Key and High Key that you can use to define the range for each part. So you can set one part using one patch to High Key B3 and a different part using a different patch to Low Key C4. Then I think you need to set both parts to use the same MIDI channel. And thus you will have effectively split the kb at C4 to play one part with LH and another part simultaneously with RH.
I guess it is a little odd that the manual doesn't just have a 'split keyboard' reference as you might expect.
Hope this helps (and hope I'm right with the above instructions given that I am working from memory from the comfort of my duvet with a cup of Earl Grey
