 const byte SONG_CONFIGURATION = 0;
 const byte CONFIGURATION_START = 1;
 const byte CONFIGURATION_FINISHED = 2;
+const byte CURRENT_PART = 3;
+const byte NEXT_PART = 4;
 
 const byte SONG_OFFSET = 10;
 

void RealTimeSystem(byte realtimebyte) {
  if (realtimebyte == CLOCK) {
    counter++;
    if (counter >= 23) {
      counter = 0;
      digitalWrite(bpmLed, HIGH);
    }

  if (realtimebyte == STOP) {
    digitalWrite(bpmLed, LOW);
    playing = false;
    changeMode(NORMAL_MODE);
  }
}

