setParams = function() {
        sound._paused = false;
        sound._seek = seek;
        sound._start = start;
        sound._stop = stop;
        sound._loop = !!(sound._loop || self._sprite[sprite][2]);
      }
Play a sound or resume previous playback.
@param  {String/Number} sprite   Sprite name for sprite playback or sound id to continue previous.
@param  {Boolean} internal Internal Use: true prevents event firing.
@return {Number}          Sound ID.