Actually, the PSR-S700 is probably the best for ethnic styles, voices, etc.., far superior to most other manufacturers. And, if you're looking for third-party, ethnic styles, well, Yamaha beats them all in that category. Korg has some neat stuff, as well as some neat sounds, but it is quite limited.

Not just JMO,

Gary

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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)