[woolion]

Were you aware of the Dato Duo (https://dato.mu/)? It's very cool for kids, except for the fairly steep price point.

The advantage is that it's limited, so it greatly reduces the wall of difficulty to manage to get some 'nice-sounding' music (mostly the restriction to the pentatonic scale). However, kids still manage to find the most horrible-sounding settings, and insist on keeping them as is...