#define BAUD 115200
String StringArray[] = {"C","C#","D","D#","E","F","F#","G","G#","A","A#","B"};
void setup() {
  // put your setup code here, to run once:
  Serial.begin(BAUD);
  //send a character A to tell processing we are ready
  Serial.println("A");
}

void loop() {
  // put your main code here, to run repeatedly:
}

//this function reads 3 integer values direcly behind each other, and expects a start character in front of it
//input should be A123,234,456\r\n
void serialEvent() {
  while (Serial.available() > 0) {
    char startChar = Serial.read();
    if (startChar == 'A') {
      //when the start char has been received and read read the 3 integers:
      int val = Serial.parseInt();
      Serial.println(val);
      Serial.println(StringArray[val]);
    }
  }
}