Reversing audio (old WebAudio sample)

reverse.js

var context = new AudioContext(),
    request = new XMLHttpRequest(),
    mp3File = 'yourFile.mp3';

request.open('GET', mp3File , true);
request.responseType = 'arraybuffer';

request.addEventListener('load', function(){

    context.decodeAudioData(request.response, function(buffer){

        var src = context.createBufferSource();
        Array.prototype.reverse.call( buffer.getChannelData(0) );
        Array.prototype.reverse.call( buffer.getChannelData(1) );

        src.buffer = buffer;
    });

});