The LT443D-AA Analog Audio Module fits into the LT443D main frame and generates analog audio test tones. Two 600 Ohm balanced outputs are provided (each on an XLR-3P connector.) Output level and frequency can be independently set for each output. Audio level can be swung from -40 to 4dBm and it is settable in 1dBm steps. Test tones can be set from 50 Hz to 20KHz (30 fixed steps) and silence.