void MP3PowerOn() {
  if(MP3ButtonPressed == false) {
    if(millis() - currentStateTime < 2000) digitalWrite(MP3Button1, HIGH);
      else if(millis() - currentStateTime < 2500) digitalWrite(MP3Button1, LOW);
      else if(millis() - currentStateTime < 3000) digitalWrite(MP3Button1, HIGH);
      else {
        digitalWrite(MP3Button1, LOW);
        MP3ButtonPressed = true;
      }
    }
  }

void NextAudio() {
if(MP3ButtonPressed == false) {
  if(millis() - currentStateTime < 500) digitalWrite(MP3Button2, HIGH);
  else {
    digitalWrite(MP3Button2, LOW);
    MP3ButtonPressed = true;
   }
  }
}

void MP3PowerOff() {
  if(MP3ButtonPressed == false) {
  if(millis() - currentStateTime < 500) digitalWrite(MP3Button2, HIGH);
    else if(millis() - currentStateTime < 1000) digitalWrite(MP3Button2, LOW);
    else if(millis() - currentStateTime < 8000) digitalWrite(MP3Button1, HIGH);
    else {
      digitalWrite(MP3Button1, LOW);
      MP3ButtonPressed = true;
    }
  }
}