Problem sound streaming flastly

Hi guys!

i have a little problem :frowning: with a streaming load sound.

this is the code:

var sound_ecdl:Sound = new Sound();
mymusic.onLoad = function(success:Boolean):Void {
    if (success) {
        trace("Sound Loaded");
        mymusic.start(0,999);
    }
};
mymusic.loadSound("musics/sound1.mp3", false);

i don’t understand because if i testing the swf i listen the sound super fastly and with IE6 too. FireFox and IE7 no.
i have read that is the bitrate mp3… something like 128 kbs 44hz to run corectly but with i can’t do the mp3 compression.

(sorry for my english)