This is for the Global App Iniative tutorial series - this is the final code the step-by-step series will lead you to complete.
MPC stands for Music Production Center: Essentially, this application gives 9 buttons that can be equipped with any sounds. On a touch, the sound will play. Multiple sounds can play in parallel. The slider bar adjust how quickly the sound plays - at minimum, it plays the sound half as fast. At max, it plays twice as quick.