FreeTTS Processing

import guru.ttslib.*;

TTS tts; //declare instance for voice 1
TTS tts2; //declare instance for voice 2

void setup() {
  size(100,100);
  smooth();
  tts = new TTS(); // construct each instance
  tts2 = new TTS();
}

void draw() {
  background(255);
  fill(255);
  ellipse( 35, 30, 25, 35 );
  ellipse( 65, 30, 25, 35 );
  fill(0);
  ellipse( 40, 35, 10, 10 );
  ellipse( 60, 35, 10, 10 );
  noFill();
  arc(50,50,50,50,0,PI);
  
}

void mousePressed() {
  tts.setPitch(110); 
  tts.setPitchRange(1);
  tts.speak("this is melody");
  
  thread("voice2"); // each voice = separate thread; trigger that thread to start by calling it here
  tts.setPitch(110); 
  tts.setPitchRange(1);
  tts.speak("this is harmony");
  
  
  
}

// thread for second voice (tts2)
void voice2() {
  delay(100);
  tts2.setPitch(131);
  tts2.setPitchRange(1);
  tts2.speak("this is harmony");
}