Pre-Amp, Buffered Multiple, Attenuator, Summing Mixer

Attenuator - non inverting attenuator, also the output jack is normalled to 10v to give an adjustable DC voltage when no input jack is present.

Pre-amp - gain of 20dB, designed for integrating ipad/phone or other equipment with your Eurorack system.

Buffered Multiple (1:2) - two buffered output signals from one input signal.

Summing Mixer (2:1) - summing mixer for quickly summing two signals or adding a DC offset to a signal.

http://www.maker.ie/uploads/1/1/5/9/11594919/lvls_assembly_guide_v07.pdf