   Serial.println("Starting PWM");
   Serial.println("(if this doesn't continue, maybe the servo board is unplugged?)");
 
-#if ENABLE_SERVOS
+#ifdef ENABLE_SERVOS
   _servoMux.begin();
   _servoMux.setPWMFreq(60);
   delay(10);

      if (_lastServoValues[servoIndex] != pulseLen)
      {
        _lastServoValues[servoIndex] = pulseLen;
  #ifdef ENABLE_SERVOS
        _servoMux.setPWM(servoIndex, 0, pulseLen);
  #endif
      }
    }
  }

    serialPrintfln("output enable -> %s", _outputEnable ? "true" : "false");
  }

  if (millis() - _lastFrameMillis > kMilliPerFrame)
  {
    if (!advanceFrame(_actionIndex == _idleAction))
