I love the sound of the instrument and am able to play simple tunes on it by ear, but the explanation of the musical notation system needs much improvement. Maybe if I were a musician I could learn from it, but I don't understand all of the markings. What do the lines under the numbers mean (In My Neighbor Totoro, | 1 3 5 - 1 | the 1 and 3 are underlined together - what does that mean?) (In Story of Time - In several places, there is a wiggly line in front of two numbers. What is tha...