We are going to work with the ToolBar for:
- Change speed
- Select a piece for repeat
Press Play
To read the music you must follow the horizontal line that is moving from left to right.
Is too fast?
Let's decrease the speed to 40 with
Is easier? . Also you can practice stopped a phrase and once have it dominated try
to play it al unison with the midi song.
To repeat a piece we stop the reproduction and dragging the song's position bar we situate us in the point
in which we want to initiate and we press the button start 
Then dragging the song'bar we situate us at the end point and we press the button
end
The position bar will show the piece selected in blue
To repeat activate the loop checkbox
To remove(clear) the selection press
clear
