gistfile1.js

function loadSound(name) { 

   function () {
        'use strict';


        var init,
            Howl = Howl || null,
            //change this
            assetSource = 'path/to/sounds';

        init = function (name) {
            var sfx;

            if (Howl) {
                sfx = new Howl({
                    urls: [assetSource + name + '.mp4', assetSource + name + '.mp3']
                });
            } else {
                sfx = document.createElement('audio');
                if (sfx.canPlayType('audio/mp4')) {
                    sfx.src = assetSource + name + '.mp4';
                }
                if (sfx.canPlayType('audio/mp3')) {
                    sfx.src = assetSource + name + '.mp3';
                }
                sfx.preload = true;
                sfx.loop = false;
                sfx.load();
                document.body.appendChild(sfx);
            }

            //returns a function that plays the sounds
            return function () {
                sfx.play();
            };
        };

        this.on(init);
    }
}


//load
var boom = loadSound('boom');

//play
boom();