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import processing.sound.*;
SqrOsc square;

void setup() {
  size(640, 360);
  background(255);
  
  // Create square wave oscillator.
  square = new SqrOsc(this);
  square.play();
}      

void draw() {
}

.play()
.play(freq, amp, add, pos)
.play(freq, amp, add)
.play(freq, amp)
.play(freq)