Excerpt: Here's my review of the Yamaha psr-s700 keyboard. This Yamaha PSR keyboard sells for about $1000 and comes with 61 regular-sized touch sensitive keys and 96 notes of polyphony. But what probably stands out the most is its Mega Voice technology. With Mega Voice technology, you can expect nothing but stunningly realistic sounds in the Yamaha PSR S700. With this feature multi samples are used across the keyboard with sophisticated velocity switching.