George,

I can assure you...the PSR-S700 will replace the PSR-1500.

The PSR-1100 was out when the PSR-2100 was current a few years ago.

Ian

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Remember to leave good news alone.
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.