As soon as it loads enuf to play (buffer), it will play. There's many variables that you're dealing with if you're just starting out with these new sound possibilities in MX. One example, like 'iaskwhy' was saying is to control them better using MC's. You can control each sound individually and have as many as 8 sounds going at once (if that's your thing). Fading, starting, stoping can all be controlled now dynamically. Along with duration, position and specific load information can all be achieved.