The attenuverter input at the top left of the module is normalled to 5V when no cable is inserted, and the signal appears at output on the top right of the Navigator. The center knob controls the amount of positive or negative scaling of this signal, as indicated by the lines on the frontpanel.
The attenuator input on the left is also normalled to 5V when no cable is inserted, and the fader controls the attenuation of this signal. The signal appears at the output on the bottom right and if no cable is inserted, its signal is mixed at unity gain with the signal at the top output.
Power consumption: 11 mA at +12 V and 8 mA at -12 V