reference code by Erik Kringen @ http://www.mycontraption.com/sound-effects-with-and-arduino/

(step2) sounds_functions_creature

//function to produce the sounds
void beep (int speakerPin, float noteFrequency, long noteDuration)
{    
  int x; // Convert the frequency to microseconds
  float microsecondsPerWave = 1000000/noteFrequency; // Calculate how many HIGH/LOW cycles there are per millisecond
  float millisecondsPerCycle = 1000/(microsecondsPerWave * 2);// Multiply noteDuration * number or cycles per millisecond
  float loopTime = noteDuration * millisecondsPerCycle; // Play the note for the calculated loopTime.
  
  for (x=0;x<loopTime;x++)   
          {   
              digitalWrite(speakerPin,HIGH); 
              delayMicroseconds(microsecondsPerWave); 
              digitalWrite(speakerPin,LOW); 
              delayMicroseconds(microsecondsPerWave); 
          } 
}     



//sounds for Tuomi, the creature!

void cricket(){
          beep(speakerPin, note_D8,10);
          beep(speakerPin, note_D8,10);
          beep(speakerPin, note_D8,10);
          delay(250);
          beep(speakerPin, note_D8,10);
          beep(speakerPin, note_D8,10);
          delay(100);
}

void squeak(){
          for (int i=100; i<5000; i=i*1.45) {
            beep(speakerPin,i,60);
          }
          delay(10);
          for (int i=100; i<6000; i=i*1.5) {
            beep(speakerPin,i,20);
          }
}

void ohhh() {
          for (int i=1000; i<2000; i=i*1.02) {
            beep(speakerPin,i,10);
          }
          for (int i=2000; i>1000; i=i*.98) {
            beep(speakerPin,i,10);
          }
}

void uhoh() {
          for (int i=1000; i<1244; i=i*1.01) {
            beep(speakerPin,i,30);
          }
          delay(200);
          for (int i=1244; i>1108; i=i*.99) {
            beep(speakerPin,i,30);
          }
}

void laugh() {
          for (int i=1000; i<2000; i=i*1.10) {
            beep(speakerPin,i,10);
          }
          delay(50);
          for (int i=1000; i>500; i=i*.90) {
            beep(speakerPin,i,10);
          }
          delay(50);
          for (int i=1000; i<2000; i=i*1.10) {
            beep(speakerPin,i,10);
          }
          delay(50);
          for (int i=1000; i>500; i=i*.90) {
            beep(speakerPin,i,10);
          }
          delay(50);
            for (int i=1000; i<2000; i=i*1.10) {
            beep(speakerPin,i,10);
          }
          delay(50);
          for (int i=1000; i>500; i=i*.90) {
            beep(speakerPin,i,10);
          }
          delay(50);
            for (int i=1000; i<2000; i=i*1.10) {
            beep(speakerPin,i,10);
          }
          delay(50);
          for (int i=1000; i>500; i=i*.90) {
            beep(speakerPin,i,10);
          }
          delay(50);
}

//optinal_extra sounds
void laugh2(){
          beep(speakerPin, note_C6,200); //C
          beep(speakerPin, note_E6,200); //E  
          beep(speakerPin, note_G6,200); //G 
          beep(speakerPin, note_C7,200); //C 
          beep(speakerPin, note_C6,200); //C
          delay(50);
          beep(speakerPin, note_C6,200); //C
          beep(speakerPin, note_E6,200); //E  
          beep(speakerPin, note_G6,200); //G 
          beep(speakerPin, note_C7,200); //C 
          beep(speakerPin, note_C6,200); //C
          delay(50);
          beep(speakerPin, note_C6,50); //C
          delay(50);
          beep(speakerPin, note_C6,50); //C
          delay(50);
          beep(speakerPin, note_C6,50); //C
          delay(50);
          beep(speakerPin, note_C6,50); //C
          delay(50);
          beep(speakerPin, note_C6,50); //C
          delay(50);
          beep(speakerPin, note_C6,50); //C
          delay(50);
          beep(speakerPin, note_C6,50); //C          
}

void robot(){
          beep(speakerPin, note_A7,100); //A
          beep(speakerPin, note_G7,100); //G
          beep(speakerPin, note_E7,100); //E
          beep(speakerPin, note_C7,100); //C
          beep(speakerPin, note_D7,100); //D
          beep(speakerPin, note_B7,100); //B
          beep(speakerPin, note_F7,100); //F
          beep(speakerPin, note_C8,100); //C
          beep(speakerPin, note_A7,100); //A
          beep(speakerPin, note_G7,100); //G
          beep(speakerPin, note_E7,100); //E
          beep(speakerPin, note_C7,100); //C
          beep(speakerPin, note_D7,100); //D
          beep(speakerPin, note_B7,100); //B
          beep(speakerPin, note_F7,100); //F
          beep(speakerPin, note_C8,100); //C
}