Modular Monthly

Logic for audio and CV

Mystic have made distinctive Eurorack modules for a few years now, pushing unique, sometimes abstract areas of synthesis functions rather than just cloning a classic filter or two. Their new logic module ANA takes two inputs and gives us six unique outputs – MIN, MAX, VCA, MAG, STEP and BOX.

MIN computes the minimum voltage value of the two inputs, MAX computes the maxi voltage at the inputs, VCA multiplies the two inputs, MAG gives us the difference between inputs, STEP performs a track and hold based smooth/stepped process and BOX performs a bipolar comparator function giving us a 3-level pulse output. All of these can be used with audio signals, CV signals or gates.

The module offers level control over its two inputs or the option to sum the input and an offset voltage which is useful for controlling the outcome of the logic functions and adjusting the outputs on the fly.

A few options they suggest: “Process CV with gain and offset. Multiply signals as a through-zero VCA with unique character. Add harmonics by rectifying a signal. Create pseudo random sequences. Distort incoming signals under voltage control. Compute boolean logic on gates or continuous voltages. Extract gates and sequences from modulation signals.”

That’s a lot of potential from a 6hp module and the real boon is its ability to work with a wide range of inputs. Mystic Circuits are still finding uses for the module, as it’s so open for experimentation – great!