Looks like it might be useful for custom linux instruments, using a Raspberry Pi or BeageBone, or even just for controlling Ardour on a PC:
Endorsement/disclosure: I have done some linux and Android development work for this guy in the past, and helped him research linux support for this project (which was very quick and easy: the multitouch is built in to kernel 3.2 and later, works out of the box).
The audio version uses HDMI, but for input one could use an external USB interface (with the USB hub version on a Pi/Beagle), or something more custom. If used with a PC instead, then one could use FFADO, etc.
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