Use Sound Sync Properties?

i have a flash file… and i put a sound file (*.mp3 format).
i use “EVENT” as Sync properties…('cause as i know, if use “STREAM” the sound
quality is not too clear). if i want to pause that sound when i press pause button,
(exactly on the frame when pause button pressed), what i have to do???

in this moment, i used this on pause button:

on (release) {
stop();

do u have an idea?? or i can use “STREAM” as sync peoperties but the quality
is clear?? how i can do that??