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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Korg PA3X / Yamaha P125 / Yamaha MX61 / QSC 8.2s / Zed mixers / Blue mics / Roland BR800