So I've coded this little toy
Little piano
I chose the common keys of AZERTY and QWERTY keyboards for playing with keyboard. (see the groupbox "Clavier" )
Del = delete the last note
Enter = play the melody
R = save/load a melody (save will not be in WAV format
)+/- = increase/decrease the imposed tempo.
RAZ = delete all the actual melody
You can try to move the mouse on the piano with the left button pressed.
Updated with tsh73 addon and fixes.
Have fun
but many thanks 
