Sinhronize audio stream?

I got a problem! Maybe it is not a problem! I got a streaming audio file as sound object! Is it possible to get buffering size ( how is loaded ) I want to sinhronize audio with mc text! example I aready got streamed 10 sec and I know it is my text " Welcome to my site" and mc play"welcome to my site" Did I made clearly understood? Another process I need to implement! I am very beginner in flashy world! Thank U