Use of If and Else conditional to make sound pause and play.

Hello! I am almost complete with my project. I have decided to use the keyboard function to have a certain key play a sound. I have gotten as far as that. But, I am stuck at how to pause the sound and also play for the same key. For Example: if you press a letter once, it'll play, and if you do it again, it'll pause it and so forth.

I've tried to use filename.rewind(); but that doesn't help from all my sounds playing at once.

import ddf.minim.*;
import processing.sound.*;

Minim minim;
AudioPlayer winter;
AudioPlayer summer;
AudioPlayer spring;
AudioPlayer fall;


MyImage flower;
MyImage fire;
MyImage sun;
MyImage snowman;
float xpos, ypos;    // Starting position of shape    

float xspeed = 5;  // Speed of the shape
float yspeed = 15;  // Speed of the shape

int xdirection = 1;  // Left or Right
int ydirection = 1;  // Top to Bottom

color c;

void setup() {
  size(800, 800);
  c = color(random(255), random(255), random(255));
  noStroke();


  xpos = width/1.8;
  ypos = height/3;
  flower=new MyImage("Flower.png");
  fire=new MyImage("Sun.png");
  sun=new MyImage("campfire.png");
  snowman=new MyImage("snowman.png");

  // will play sound
  minim = new Minim(this);
  winter = minim.loadFile("Winter Mix.wav");
  summer = minim.loadFile("Summer Mix.wav");
  spring = minim.loadFile("Spring Mix.wav");
  fall = minim.loadFile("Fall Mix.wav");
}   


void draw() {
  background(c);
  textSize(20);
  text("R for Spring S for Summer & W for Winter", 80, 100);
  flower.update();
  sun.update();
  fire.update();
  snowman.update();

  flower.draw();
  sun.draw();
  fire.draw();
  snowman.draw();

  if ((keyPressed == true) && ((key == 'S') || (key =='s'))) {
    summer.play();
    summer.rewind();
  }
  if ((keyPressed == true) &&((key == 'W') || (key=='w'))) {
    winter.play();
  }
  if ((keyPressed == true) && ((key == 'R') || (key =='r'))) {
    spring.play();
  }
  if ((keyPressed == true) && ((key == 'F') || (key =='f'))) {
    fall.play();
  }
}
void mousePressed() {
  c = color(random(255), random(255), random(255));
}

class MyImage {  // A class that specifically keeps the images within the canvas. Helped with Forum in Processing 

  PImage img;
  float x, y;
  int w, h;
  float xspeed, yspeed;


  MyImage(String flower) {
    w=h=200;   
    x=random(w, width-w);
    y=random(h, height-h);
    xspeed=yspeed=5;
    img=loadImage(flower);
    img.resize(200, 200);
  }

  MyImage() {
    w=h=200;   
    x=random(w, width-w);
    y=random(h, height-h);
    xspeed=yspeed=5;
    img=getMeImage(color(0));
  }

  MyImage(color c) {
    w=h=200;   
    x=random(w, width-w);
    y=random(h, height-h);
    xspeed=random(9, 13);    
    yspeed=random(7, 10);
    img=getMeImage(c);
  }


  PImage getMeImage(color c) {

    PImage img=createImage(w, h, RGB);
    img.loadPixels();
    for (int i=0; i<200*200; i++)
      img.pixels[i]=c;
    img.updatePixels();
    return img;
  }

  void update() {
    if (x > width-w || x < 0) {
      xspeed *= -1;
    }
    if (y > height-h || y < 0) {
      yspeed *= -1;
    }
    x+=xspeed;
    y+=yspeed;
  }

  void draw() {
    image(img, x, y);  //ImageMode corners
  }
}

This is the full code. Thank you for your help

Melanie