int sliderReading; //slider reading
int phoReading;   //photocell reading
int frequency1;
int frequency2;

void setup() {
  Serial.begin(9600);
  pinMode(8, OUTPUT);
}

void loop() {

  //reading the light sensors
  sliderReading = analogRead(A0);
  phoReading = analogRead(A1);

  //mapping each frequency
  frequency1 = map(sliderReading, 1, 1023, 100, 500);
  frequency2 = map(phoReading, 1, 1023, 100, 500);

  //change the pitch, putting two frequencies together
  tone (8, frequency1 + frequency2);

}