I never played a 800 but just to correct something mentioned here the 500 does have Guitar mode. In my country the 800 more than doubles the price of the 500
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Victor

Korg Pa3x 61 - Mediastation X76 - Yamaha Psr s900 - Korg Tr61 - Roland PK5A - NanoKontrol - Ensoniq SQ1 - Yamaha D85 organ