MATRICO has three inputs I - III which can be routed to any of the three outputs A-C. For each connection between I-III and A-C there is a separate potentiometer which acts as an attenuator/attenuverter. For each output A-C you can decide whether the signals should be processed unipolar or bipolar.

The LEDs indicate whether a positive or negative signal is present at the respective input. They only show input signals, as it is so much easier to identify a signal to be mixed with other signals.

There is also a sum output with LEDs that provides a mix of all outputs.