In addition:

- no mic input or vocal harmonizer
- no aftertouch
- non colored screen
- less wattage speaker output (I think)

But the 500 (to me) sounds extremely good too.

zuki
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)