It is the application which performs percussion.
Percussions : drums, tambourine and triangle, congas and maracas
Rhythm pattern : The rhythm pattern of each musical instrument can be chosen and performed automatically.
Tempo : Tempo adjustment of a rhythm pattern can be performed. (If a value is touched, the direct entry of the numerical value can be carried out. A number pad will be closed if it touches except a number pad.)
Shake : If a shake setup is turned ON, a tambourine and the maracas can shake iPhone and can make sound.
Musical instruments can be touched, or shaken and played, performing a rhythm pattern automatically.
(When iPhone itself is in silence mode, sound does not come out.)

- The kind of rhythm pattern -
Drums : 10 kinds (8th, 16th, 6/8, Shuffle, Swing, Songo, 8thA, 8thB, 16thA, 16thB)
Tambourine and Triangle : 8 kinds (4thA, 4thB, 8thA, 8thB, 8thC, 16thA, 16thB, 16thC)
Congas and Maracas : 8 kinds (4th, 8thA, 8thB, 8thC, 16thA, 16thB, 16thC, 16thD)