getType() {
    return this.oscillator.getType();
  }
Returns current type of internal oscillator eg. 'sine', 'triangle', 'sawtooth' or 'square'.

 @method  getType
 @for p5.MonoSynth
 @returns {String} type of internal oscillator  eg. 'sine', 'triangle', 'sawtooth' or 'square'.