Here's what Kurzweil has to say...
The SP4 Series are premium instruments designed for musicians who require exceptional sound quality and expression. Top professionals and hobbyists alike will be able to appreciate the responsive actions, nuanced sound design and advanced performance features, all of which set the SP4 Series apart.
Equipped with many of the same sounds and effects as our acclaimed PC3 family, the SP4 Series offers the best Kurzweil has to offer; a variety of exquisite acoustic pianos, vintage electric pianos, dazzling string sections, lush pads, KB3 organs, mallets, drums, basses, guitars and more. With four programmable zones, the SP4 series conveniently allows you to create splits and layers at the touch of a button, which means you can react and adjust your sound in a live setting on-the-fly with comfort and ease.
With additional sounds online available for download, you can create a personalized sound set with absolutely no "filler". Don't need drums or guitars? Download extra electric pianos and KB3 organs. Also, the SP4 Series can load programs created on our PC3 and PC3LE keyboards. All of this means that you, the player, can be involved in shaping the character of an instrument that you can truly call your own. Pricing and Availability:
The Kurzweil SP4-7 is available in the UK now priced at just £680 + VAT. The SP4-8 is expected in Q2 2011 priced at just £880 + VAT.