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This prototype guitar-iPad hybrid, the Mantaray, aims to synthesize digital applications and musical technology to create a new DJ setup in the form of a guitar.
One thing that this design does facilitate is the ability to use multiple devices with both hands, rather than focusing on one at a time.
The video below is the promotional version of the prototype -- and includes its use with the iShred and Kaoss applications available on iPad. It is no longer known as the iTar, as another company owns the trademark.