What is the smoothest audio API for looping iPhone sounds

I am trying to loop a 2 second sound continuously that I am using 开发者_运维问答in my touchesMoved method and want to make it play continuosly and not stutter or stop because the user stopped moving their finger and also maybe fade the sound into itself smoothly. I have tried system sounds and AVAudioPlayer

i've alreay offered you to use OpenAL in your previous question