just regarding the 3 upper voice thing - I was very surprised yet Impressed to discover that the Korg PA50SD has 3 upper voices...

and it costs half the price of the PSR S910...

why must a Yamaha fan pay Tyros 4 price to get 3 upper voices? its not breakthrough technology
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Roland G70 / Roland BK9 / Roland GW8-L / Yamaha Motif XS / Technics KN6500