This is the exact same problem as the S950/BK-9 comparison. This doofus is taking them out of the box and playing them without the slightest effort to balance them style/RH balance and volume wise...
What I wouldn't give for a chance to plug a bloody expression pedal in both of these. I don't get it. If these things are supposed to be the descendants of home organs (and marketed to the same kind of players) why no friggin' volume pedal? All it would take is riding the pedal a hair, and the style/RH balances would have been much better!
If he's reading this... on Roland's, PUT THE BALANCE KNOB TO 9-10 O'CLOCK! Or the RH will drown out the backing.