MIX is Unity Mixer / Precision Adder / Average Mixer for CV or Audio in 1U format
With two sets of three inputs to one output you can combine any CV or Audio signal precisely.
both of the sets are normalized so you can use one set of 5 inputs to one output as well.

Unity / Average:
Jumpers on the back of the module will let you choose between two summing modes for each of the sets:
Unity Gain - Will summarize the inputs signals precisely, this mode is useful to combine CV for adding precise pitch control voltages (CVs) or combine any other signals without loosing gain.
Average Gain - Will summarize the inputs signals precisely with a gain of 1⁄3. It is useful for mixing audio signals without causing clipping.