Comment by dotancohen

This is terrific!

On Firefox Android, in step four, I managed to get into a situation where one of the notes kept playing. It occurred when pressing too many keys on the keyboard demonstrating the chromatic scale. Pressing each key again for not "unstuck" it.

And if I'm already providing feedback, then a nice improvement for the end of step two would be an option to hear the two notes of the displayed waves, together.