This is a fun project for someone who is good at developing apps. Make the cellphone replicate this musical instrument which is very common in South Asia. The name of this is 'DUGG DUGGI'. It is simply a mini drum with two strikers on strings tied to it. The sound it makes is the same; the only change is in its frequency. If it is oscillated at a regular pace, it makes a steady rhythmic sound and if it is jerked, it makes the same sound at a rapid rate..