Inverter
From TheAnalogThing
Inverters are elementary calculating elements of analog computers. They reverse the sign of their inputs (Additive inverse for real numbers). Mathematically, an inverter performs OUT = -IN. The Analog Thing features four inverters, laid out in four rows.
Simple use of an Inverter
Connect a single input line to the 1 input. Do not stack multiple input jacks as only a single input signal is allowed. At the output, you can stack any number of connector plugs as needed.
Using an inverter as a summer
Together with a XIR, an inverter can be used as a fully featured Summer. To do so, connect the SJ (Summing Junction) jacks of both elements and then use the weighted inputs of the XIR as you would use them with a Summer.
