Then edit every velocity of percussion. Lifelike sounds of percussion are expected to be heard, so edit the velocity of percussions could vary the dynamic instruments. For example, the rhythmic pattern that played by high and low bongos, the main beat which is usually the first beat is arranged to higher degree of velocity than other beats. This could make the sound more like to be played by a real bongo player. The folk song melody is played by grand piano only and accompany by string and percussion instruments.
Piano is the most common keyboard instrument.
The folk melody is arranged to be played in three different octaves. It did not use one track 1 to 'copy' and become track 2 with different pitch because is will sound exactly same except the different pitch. It sounds like robot play two pianos at the same time. Those three tracks, therefore were played at three different times with three different octaves, each track of melody sounds slightly out of time with other two tracks . The reason to arrange this is because the three tracks could sound like three different people play the piano.