Prodys PortaNet User Manual page 128

Following is showed the dialog to select the headphones configuration.
By right clicking on each cross point a new dialog appears that allows the user to
define the behaviour of the selected output depending on where the
corresponding input is connected, that is, depending on if the MIC/LINE level
input is connected to the program line or to the talckback line. Also, it allows the
user to select whether the signal will be controlled from the audio input keypad.
X.4.1.1
Attenuation when the MIC/LINE level input goes to Talkback or
Program
It is possible to define an automatic attenuation on signals that feed the
headphone outputs when the corresponding inputs go from Program to Talkback
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