
"Software synthesizers have made tremendous advances in their ability to produce the subtle, humanlike solo note expression normally associated with traditional acoustic instruments. However, when played from midi keyboards, they tend to sound somewhat stiff and unnatural. If you've ever tried to play a midi keyboard with a software synthesizer or sampler in order to simulate a convincingly human sax, clarinet, violin, cello or guitar solo, you're probably aware of this limitation. It turns out that their key pressure and bend/mod wheels aren't quite up to the note expression capabilities of acoustic solo instruments..."
via Roger Linn Design where you'll find full details. Don't miss this post for new videos of the prototype.