function Listener3D(type) {
    listener3d_classCallCheck(this, Listener3D);
    this.ac = main.audiocontext;
    this.listener = this.ac.listener;
  }
Add a new band. Creates a p5.Filter and strips away everything but
the raw biquad filter. This method returns an abstracted p5.Filter,
which can be added to p5.EQ.bands, in order to create new EQ bands.
@private
@for p5.EQ
@method  _newBand
@param  {Number} freq
@param  {Number} res
@return {Object}      Abstracted Filter