_allocateVoices() {
    for (var i = 0; i < this.maxVoices; i++) {
      this.audiovoices.push(new this.AudioVoice());
      this.audiovoices[i].disconnect();
      this.audiovoices[i].connect(this.output);
    }
  }
Construct the appropriate number of audiovoices
@private
@for p5.PolySynth
@method  _allocateVoices