_calcFreq() {
    //Seconds mode, bpm / timesignature has no effect
    if (typeof this._interval === 'number') {
      this.musicalTimeMode = false;
      return 1 / this._interval;
    }
    //Musical timing mode, calculate interval based bpm, interval,and time signature
    else if (typeof this._interval === 'string') {
      this.musicalTimeMode = true;
      return (
        (this._bpm / 60 / this._convertNotation(this._interval)) *
        (this._timeSignature / 4)
      );
    }
  }
Calculate the frequency of the clock's callback based on bpm, interval, and timesignature
@private
@for p5.SoundLoop
@method  _calcFreq
@return {Number} new clock frequency value