cv inputs 1 and 3 - cv input for bidirectional attenuation. when input cables aren't plugged into these jacks, 5V reference signals will be used. cv input 2 - cv input for either unidirectional or bidirectional attenuation. when an input cable isn't plugged into this jack, a 5V reference signal will be used. switch - toggles cv input 2 between unidirectional and bidirectional attenuation
cv outputs 1, 2 and 3 - attenuated cv output. if no cables are plugged into an output jack, it is summed into the subsequent output jack.