Set-up and operation is pretty simple: grab two 1/4" TRS cables and connect the Analog Four/Keys's CV AB output with the CV:AB input at the Synapse module. Same with the "C&D" signals.
All four CVs are available now at individual 3,5mm sockets. Bi-color LEDs display the amplitude and polarity of the signal (green = positive, red = negative). Full range of the Elektron machines (+/-10V) can be used without limitation and the signals are passed through unaffected.
Most probably you can use the module any other gear equipped with those pesky TRS outputs with two CVs like Doepfer's MCV4 for instance.
two 1/4" TRS inputs: CV:AB and CV:CD
Four CV outputs: A, B, C and D
3U Eurorack module, 6HP wide, 30mm deep
power consumption: 30mA