Just a thought...
Can you split the keyboard in 2 sections and assign the same instrument for the left and right parts?
It will sound exactly the same as without split, but maybe the Tyros will not cut what you play with the right hand when you press chords in with the left because it will be on a "different" part of the keyboard.
Iam not sure I described it well, not sure if it can be done.

.........
Now I realised i described what was proposed above, sorry guys, got to get more coffee....

[This message has been edited by trident (edited 01-09-2007).]