The manual is a good addition to your already knowing knowledge of how arrangers or any unit works depending on your experience....it is not an only source to learning a unit...most are written poorly.
Some day when these manufacturers start to include all Level Instructional QUALITY Produced DVD's for all their products, sales will increase, end users will find more enjoyment in their units, music will flourish & people will be happy because they can learn more about their instrument by watching & reading combined.