・The first screen to be displayed is the keyboard screen. Touch the gear button in the upper left corner to enter the setting screen. ・The number of keyboards on the keyboard is 91 (A0-D#8). The number of keyboards that can be displayed at a time is 49 keys on a portrait screen (25 keys for iPhone), and 43 keys (19 keys for iPhone) on landscape screens. ・If you touch the buttons placed in the four corners, you can move the range of the keys up and down by 1 octave. ・When you press the central button, the color of the button changes to blue, and it changes to a mode that allows you to change the octave by dragging.