Movie continues after all sounds played

[Flash CS3/AS2]
I have this…

waveNoise1 = new Sound();
waveNoise1.attachSound("waveNoise1_snd");

this.waveNoise1_mc.onRollOver = function() {
    waveNoise1.start(0,1);
};

Is there a way to detect if this sound has been played, and then (and only then) will the movie continue to the next frame.

p.s. can this be applied so that multiple sounds have to be played through once to continue?