The disclosed embodiments provide a component for a portable electronic device. The plies overlap each other to maintain continuity of the structure. The feedback circuit input is arranged for receiving a signal that is based on the amplified analog signal of the analog amplifying circuit. The invention is characterised in that the speed control cam is disposed below the base of the blow mould. The second adjusting structure has a side bar whose end is disposed with an instrument, such as drum or cymbal.