Hi Ken,

Both have the capability of vocal record and playback.

The S900 records and plays back Wav only.

Have you actually played the PA-800?

The S900 has much more third party support and available styles, and of course it has Yamaha's famous SA and Mega voices.

Let your ears be your guide, and good luck with your choice.

Ian
_________________________
Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.