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 / Korg PA1000 / Bose Compact L1s (2) / Zedi-6FX / Tascam DP24CD / Baby Blue and Encore 300 mics / Zoom Q8