Play piano on a HoloCube!
From left to right: middle C, D, E, F, G, A, B... press the up button to increase the octave. Mapping on a cube is great for little hands, which can't easily reach octave to octave.
But piano is totally black and white and boring. What if you could design your own piano keys. And sell them on a Cubestrument platform!
And also design your own soundwave form profiles.
It lets you play music and is also a instrument design platform - both visually and actual individual audio profiles!