Hi,
This layout control the Grand Piano XXL from V3Sound.
https://www.v3sound.com/en/e-product-grand-piano-xxl.html
Among the feature, you can touch the keyboard image to test the sound with different velocities from left to right. You can also read the manual by touching the image (Wi-Fi connection required).
You can also find other layouts for this product here:
https://www.v3sound.com/en/e-news.html
Enjoy!