ActionScript 2.0 :: Keep The Volume As It Is Once The Audio Loops Again?

Im able to stream audio with the following code:

Code:
sonido = new Sound();
sonido.loadSound("images/warp.mp3", true);
sonido.onSoundComplete = function() {
sonido.start();
sonido.setVolume(50);
}

I use this code to disable the audio file:

Code:
sonido.setVolume(0);
}
As soon as the audio file repeats, the volume goes up again.I need to know if I can keep the volume as it is once the audio loops again.