That seems to be based on the same idea as the Linnstrument[0], which is fairly widely available now, and sends MIDI data in the standard way over USB or DIN ports without requiring a client application. Its creators Roger Linn and Geert Bevin (programmer) were some of the original drivers of the Midi Polyphonic Expression standard alongside Roli. It's quite funny, but it seems that Geert is also behind a lot of other MPE-compatible software now, including Moog's iOS apps. His YouTube channel is a treasure trove of current and near-future music tech[1].

I have one, and it's great for learning how to play music, because the silicone pads light up according to the configured musical scale. Really well thought out as an instrument, and I believe it's also open source if you want to hack around with the Arduino microcontroller inside.

[0]: http://www.rogerlinndesign.com/linnstrument.html [1]: https://www.youtube.com/channel/UCJyEknT0SnyUr4wdvmObWHQ