seekAndEmit = function() {
            // Restart the playback if the sound was playing.
            if (playing) {
              self.play(id, true);
            }

            self._emit('seek', id);
          }
Get/set the seek position of a sound. This method can optionally take 0, 1 or 2 arguments.
  seek() -> Returns the first sound node's current seek position.
  seek(id) -> Returns the sound id's current seek position.
  seek(seek) -> Sets the seek position of the first sound node.
  seek(seek, id) -> Sets the seek position of passed sound id.
@return {Howl/Number} Returns self or the current seek position.