The Gong Kempur Kemong are instruments that mark the musical cycles called gongan, and are used in every piece.
Use your finger as mallet!
Note that the Gong and Kempur produce very low-pitched sounds and require a high-quality sound system for best sound reproduction. The use of a high-quality headphone or external amplifier with good bass response is recommended.
Play on iPhone/iPod touch with 4-inch screen?
Graphics were also optimized for iPhone and iPod touch with 4-inch screen.
Play on iPad?