Minim Ugens AudioOutput, playNote only once

Hi, I am working on a sketch that recognises faces and plays notes depending on the location/size of said faces. However, currently the playNote function just repeatedly plays the same note over and over, as opposed to just once.

I realise that the problem currently is that the only way I could find to use the parameters of the face detection rects is to put the playNote in the same brackets as them. Meaning that of course, as the rects are being permanently drawn, so are the notes being permanently created.

How can I have a playNote function that runs on the faces[i] parameters but doesn't have to be in the same 'for' brackets?

All help is greatly appreciated, here is my code currently

import gab.opencv.*;
import processing.video.*;
import java.awt.*;

// audio bits
import ddf.minim.*;
import ddf.minim.ugens.*;
AudioOutput out;

Capture video;
OpenCV opencv;

void setup() {
  size(640, 480);
  video = new Capture(this, 640/2, 480/2);
  opencv = new OpenCV(this, 640/2, 480/2);
  opencv.loadCascade(OpenCV.CASCADE_FRONTALFACE);

  video.start();

  Minim minim = new Minim(this);
  out = minim.getLineOut();
}

void draw() {
  scale(2);
  opencv.loadImage(video);

  image(video, 0, 0 );

  noFill();
  stroke(0, 255, 0);
  strokeWeight(3);
  Rectangle[] faces = opencv.detect();
  println(faces.length);

  for (int i = 0; i < faces.length; i++) {
    println(faces[i].x + "," + faces[i].y);
    out.playNote(0, 1, (faces[i].width*2));
    rect(faces[i].x, faces[i].y, faces[i].width, faces[i].height);
  }
}

void captureEvent(Capture c) {
  c.read();
}