Status codes flashed on the LED and played with the piezzo buzzer

The software displays the transmitter status on the LED continuously:

Code	Message
	Alarm: battery low voltage
	Command mode
	Alarm: settings failed to load from EEPROM
	Alarm: throttle security check failed
	The active model number, in transmission mode

Additionally, the status is played with the buzzer:

• Model numbers are played 3 times with a high pitch
• Alarms are played continuously with a low pitch