//Gijs Gieskes 2009

byte length = 100;
boolean hold = false;
byte wave[255];
unsigned long time = 0;
int gpitch = 10;

void setup() {
  //speed up PWM on pin 9 and 10: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1235060559
  TCCR1B = TCCR1B & 0b11111000 | 0x01;
  
  pinMode(9, OUTPUT);
}

void loop() {
  
  rec();
  
  //playback array
  for(byte i=0; i<length; i++){
    if(!hold){
      analogWrite(9, wave[i]);
      delayMicroseconds(gpitch);
    }
  }
}

void rec(){
  static byte counter = 0;
  
  if(millis() - time > 20){
    time = millis();
    
    counter++;
    counter %= length;
      
    int a = constrain(analogRead(5), 0, 700);  
    
    if(a > 10){
      hold = false;
    }else{
      hold = true;
    }
    
    //set the picth
    gpitch = a+1;
    
    //map for analogWrite and store in array
    a = map(a, 0, 700, 0, 255);
    wave[counter] = a;
  }
}