need to check if adding an Audio is useful or not

you should not use Audio. In this case, you can use the audioEffects to play the note

use the ones in playpiano

http://doc.qt.io/qt-5/qml-qtgraphicaleffects-coloroverlay.html
Note: It is not supported to let the effect include itself, for instance by setting source to the effect's parent.

It should be outside

line