WHAT'S THAT THING ?
This is a bank of 4 Attenuverters.
That can be used as :
- 4 independant Attenuverters.
- 4 input mixer, with the SUM output.
- 1 to 4 signal dispatcher, with the MAIN IN input.

To be simple:
All 4 outputs are mixed together to the SUM output. Which therefore works in addition to the separate outputs of each circuit.
And the MAIN IN entry is added to the input of each circuit.

The module can also be used as an extension to LE modules with CV-controllable parameters:
The output of the 4 circuits is taken from the back of the module in the form of a 5 PIN connector (the 5th is the ground, just in case).
Simply connect one or more of these pins to the same type of pin on the module to be controlled.
We added a CV input to the module to be extended, which this time has an amplitude (and inversion!) setting.