PLEXUS Time-Based Logic Operator

Alyseum PLEXUS

Alyseum Plexus is an experimental Eurorack module that offers four innovative modes for creating logic and analog control signals that respond dynamically to pulses and frequencies. A time-based logic and analog operator, it can serve as a sequencer, comparator, tracker, or pendulum-style LFO—producing evolving voltage that can unlock new rhythmic and melodic relationships within your rack. Using the intuitive controls, set the Rate of the internal oscillator, used for determining the refresh rate of the output CV signals. The two F1 and F2 controls interact with the Rate Oscillator depending on the mode.

Mode 1 is a Frequency Tracker that uses the CLK input and F1 control to extract a frequency. Mode 2 is a Window Frequency Comparator that increases the output voltage when the preset voltage range is exceeded; decreases the voltage when it goes lower. Mode 3 is a Pendulum Pulse Counter that increases the voltage at each pulse until it gets to the maximum, then starts to fall until it reaches its minimum, before continuing. Mode 4 is an Up/Down Pulse Counter that increases or decreases the output voltage depending on the input voltage at the U/D input jack. Deep and versatile, the Plexus from Alyseum is a fantastic module for any size system, offering creative voltage options with unparalleled interactivity.

PLEXUS Features

• 4 Mode logic and analog operator module
• Modes: Frequency Tracking, Window Comparator, Pendulum Counter, and Up-Down Counter
• Adjustable rate oscillator from 1–100Hz with visual LED feedback
• Dual CV outputs (+/-5V) with analog inversion for complex modulation
• Three logic outputs (HI, MID, LO) configurable as triggers or gates
• Frequency and pulse control via knobs or CV inputs
• Pulse multiplication up to 64x for rhythmic variation