The PSR-S750 is essentially the earlier PSR-S910, but without the vocal harmony and using the same sound system as the PSR-S950.
It has the same SA voices as the S910, and the same styles and polyphony.
It's an awesome little keyboard, and a great bang-for-the-buck.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.