Allows you to verify if the orders sent by the 4 console faders are well connected on the DDO 12/DDO120 interface. Also works if the faders are connected directly on relay card.
This implies that the connections between the audio console and the input plug Sub-d 37 pins are done.
Activate fader 1 on the console, the indicator in the setup must turn red.
Do the same for the 3 other faders.