Audio reverser

import flash.media.*;
import flash.utils.*;
import flash.events.*;

trace("location X",getTimer());

var buff:ByteArray=new ByteArray();

var s:Sound=new Test();

var read:uint;
do {
    read=s.extract(buff,4096);
} while(read==4096);

trace("location Y",getTimer());

var s2:Sound=new Sound();
s2.addEventListener(SampleDataEvent.SAMPLE_DATA,gen);

var pos:uint=buff.length;

function gen(e:SampleDataEvent):void {

    for(var i:uint;i<8000 && pos > 0;++i,pos-=8) {
        buff.position=pos-8;
        e.data.writeFloat(buff.readFloat());
        e.data.writeFloat(buff.readFloat());
    }
}

s2.play();

trace("location Z",getTimer());