A simple sin wave sound.

SineSound.as

// SineSound.as
// A simple sine sound.
//
// compile option
// mxmlc -target-player 10.0.0 SineSound.as

package {
    import flash.display.Sprite;
    import flash.events.SampleDataEvent;
    import flash.media.Sound;
    
    public class SineSound extends Sprite
    {
        private var frequency:Number= 440;
        private var gain:Number= 0.25;
        private var rate:int= 44100;
        private var pitch:Number= rate / frequency;
        
        public function SineSound()
        {
            var s:Sound= new Sound();
            s.addEventListener(SampleDataEvent.SAMPLE_DATA, makeWave);
            s.play();
        }
        
        private function makeWave(event:SampleDataEvent):void {
            for (var i:int= 0; i < 8192; i++) {
                var pos:int= i + event.position;
                var phase:Number= (pos % pitch) / pitch; // 0 <= phase < pitch                  
                var v:Number= Math.sin(2 * Math.PI * phase) * gain;
                // var v:Number= phase < 0.5 ? gain : -gain; // Rectangle Wave
                
                event.data.writeFloat(v);
                event.data.writeFloat(v);
            }
        }
    }
}