Module A-183-2 is a simple voltage offset generator combined with an attenuator/polarizer for the CV input.
This is how the A-183-2 works: At the two output sockets (simply two connected sockets) appears a DC voltage that is adjusted with the Offset control in the range 0...+5V or -5V...+5V.
An internal jumper is used to select the offset range (0...+5V or -5V...+5V).
Other ranges are possible by changing a resistor on the pc board (e.g. 0...+10V or -10V...+10V). The DC voltage generated by the Offset control is overlaid by the attenuated voltage that is fed to the In socket. The function of the attenuator control can be set to Attenuator or Polarizer by means of a toggle switch.
When the switch is in the Attenuator position the control works as an usual attenuator, i.e. zero level at the fully CCW position and max. level and the fully CW position.
When the switch is in the Polarizer position the control works as a polarizer, i.e. zero level appears at the center position.
Right from the center position the In signal is added to the offset voltage, left from the center position the In signal is subtracted from the offset voltage.
In other words:
at the fully CW position the non-inverted In signal is added with the full level to the offset voltage, at the fully CCW position the inverted In signal is added with the full level to the offset voltage.
The amplification range for the input will be probably 0...+2 in the attenuator mode, and -2...+2 in the polarizer mode, i.e. the maximum amplification will be x2 and the module can be used also to amplify CV or audio signals (for other amplifications only the value of a resistor has to be changed).