Don,
In my store I am using a Yamaha DGX300 to control the MidJay. I'm only using Midi Channel 1 which is the default on both products and the DGX is just being used as a controller keyboard. I push all the buttons on the MidJay which is right above the keyboard. I haven't even tried to use the DGX for style and voice changes but I'm sure I could if I want. I'll try it tomorrow at the store.
George Kaye
Kaye's Music Scene