Jordan Rudess posted this sneak preview of an upcoming iPad app from Wizdom Music, Tachyon.
Tachyon is designed to let you graphically morph between two sounds. The iPad surface is used as a multitouch XY interface, where the x-axis controls pitch and the y-axis controls the blend of two different sounds.
Pricing and availability are TBA.
Check out the demo and let us know what you think of Tachyon!