If you're interested, this is my playlist of the 7 demo videos I've made with the BK-9 (of which the above demo bits were composed).
The second one, Superstition, includes a tough exercise to move left and right hand very independently playing 2 different rhythmic funk patterns.

https://www.youtube.com/playlist?list=PLpW7b6MlANe49Dip1w_NoL8ySJte3evUN