This is a simulation software of drum,you can learn some simple rhythm by the Teaching function. Also,you can play music in "Music+Videos" hub before launch this app. Fantastic sound quality you will get when with the headset. and Sound without any delay. However,for those who have no musical flair and flexible fingers,it is difficult to play it well,at least for me. support : email@example.com for the minimum delay,I think the CPU and GPU is too busy. but the app perfect run in my Samsung Omina7. please send me your phone name to firstname.lastname@example.org if you want ,I can fix noise bug in your phone. think you.