int notes[] = {262, 294, 330, 349};

void setup() {
    Serial.begin(9600);
}

void loop() {
    int keyVal = analogRead(A0);
    Serial.println(keyVal);

    if(keyVal == 1023){
        tone(8, notes[0]);
    } else if(keyVal >= 970 && keyVal <= 1010){
        tone(8, notes[1]);
    } else if(keyVal >= 505 && keyVal <= 931){
        tone(8, notes[2]);
    } else if(keyVal >= 5 && keyVal <= 10){
        tone(8, notes[3]);
    } else {
        noTone(8);
    }
}