That's an extra button to press. I would think that would be a problem for live play. There is no numeric keypad either. That would mean pressing the EXB button and pressing 1 and 2 to get to the 2nd piano voice. Does this mean there are only 81 voices? Roland uses a simlar method of accessing voices, but it has a variation button to access further voices, still more key presses.
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I play Roland EM20 and Yamaha PSR550