that's cool . . . but . . .
playing with the mouse is way too complicated, plus, some people either don't have the coordination to use the mouse effectively or they move the pointer too fast or too slow. but you've got eight notes, and eight fingers to use, so keyboard controls wouldn't be so bad. IMO, keyboard controls are much better than use the mouse. oh, and it might help if you number or show the notes, not everyone can read a musical scale you know. good job though, keep 'em coming.