This app can easily check the sound of the chord tone and the display on the keyboard from the chord list of 54 chord pattern. You can select the chord button list display from the following patterns. - Displayed in 54 types of chord pattern rows and 12 key columns. - Displayed in 12 key rows and 54 chord pattern columns. - 54 types of chord patterns are displayed in a list for each of the 12 keys. When the chord button is tapped, the selected chord is played and the chord tone is displayed on the keyboard. * If you'd like to display all the chord patterns including tension (b9, # 9, 11, # 11, b13, 13), You need In-App Purchase. The keyboard can be slid with the slider. (range: C2 ~ C7) The keyboard also supports playing. * There are 28 types in all kinds of sound. (It is 9 kinds can be used in the initial state. To use all type, you need In-App Purchase.) * Supports Bluetooth MIDI connection. * Supports sending MIDI messages (note on / off). (To use this, you need In-App Purchase.) Chord list: M, 7, 7(b5), 7(#5), 6, 6 9, 9, add9, M7, M9, M7(b5), M7(#5), m, m6, m6 9, m(#5), m add9, m7, mM7, m7(b5), m7(#5), m9, mM9, aug, dim, dim7, sus4, 7sus4, 9sus4, M7sus4, M9sus4 (To use below, you need In-App Purchase.) 7(b9), 7(#9), 7(#11), 7(b13), 7(13), 7(b9 #11), 7(b9 b13), 7(b9 13), 9(#11), 9(b13), 9(13), 7(#9 #11), 7(#9 b13), 7(#9 13), M7(#11), M9(#11), M7(13), M9(13), m7(11), m7(13), m9(11), m7(b5 11), m7(b5 13) If you would like to use features such as playing on a large keyboard or creating chord progressions, try iOS app "Piano Chords Master".