Reyong is a row of 12 gongs or kettles mounted on a frame, and is played by four players. It plays the interlocking parts kotekan and also marks the music by the patterns it plays.
By pressing the "Zoom in" button, you are brought to the zoom view. You can then shift the registers by pressing the arrows.
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Graphics were also optimized for iPhone and iPod touch with 3.5-inch screen.