Hi Diki
The way it is achieved is patented; however there is always more then one way to achieve the same result.
The reason Wersi can cover all the Yamaha Mega styles etc, is not because it is licensed from Yamaha but they have written their own software to achieve the same result.
It’s also ironic that such a minor feature as direct Yamaha style play has overshadowed what the Wersi OAA is about.
Regards

Bill