I think he does what a lot of arranger players do, though.... the solo sits 'on top' of everything, quite a bit louder than you would have mixed a CD. Nice performance, though.
One of my big regrets with the Roland's is that the Aux. outputs bypass the effects, so you can't run the Style parts out through one set of outputs, and the lead parts out through another, and bang the lead parts up in your monitors a tad more than the main mix has it. That way you don't destroy the main mix for a little 'more me'!
Oh well, next year in Jerusalem....
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An arranger is just a tool. What matters is what you build with it..!