instruo-eas

Instruo eãs

Cascading Boolean logic gate module for Eurorack

4 HP Eurorack module

The Instruo eãs is a compact 4HP cascading logic module that provides all classic Boolean gate functions: AND, NAND, OR, NOR, XOR, XNOR, and NOT. The four logic sections are internally normalised in a cascade chain, allowing complex logic operations with minimal patching. The module processes gate and trigger signals to create syncopated rhythmic patterns, CMOS-style ring modulation effects, and creative patch routing solutions.

Features

  • AND and NAND gate logic with two inputs
  • OR and NOR gate logic with two inputs
  • XOR and XNOR gate logic with two inputs
  • NOT inverter gate
  • Internal normalisation cascades NAND → OR, NOR → XOR, XOR → NOT
  • AND In 1 normalled to AND In 2 for single-cable operation
  • Works with gates, triggers, and audio-rate signals for CMOS-style ring modulation
  • Reverse polarity protection on power connector

Controls & Jacks (14)

  • AND In 1— First input to the AND/NAND logic gate section. Normalled to AND In 2.
  • AND In 2— Second input to the AND/NAND logic gate section. Receives AND In 1 via normalisation when unpatched.
  • AND Out— Output of the AND gate. HIGH only when both AND inputs are HIGH.
  • NAND Out— Inverted AND output. HIGH when one or both AND inputs are LOW. Normalled to OR In 1.
  • OR In 1— First input to the OR/NOR logic gate section. Receives NAND Out via normalisation when unpatched.
  • OR In 2— Second input to the OR/NOR logic gate section.
  • OR Out— Output of the OR gate. HIGH when one or both OR inputs are HIGH.
  • NOR Out— Inverted OR output. HIGH only when both OR inputs are LOW. Normalled to XOR In 2.
  • XOR In 1— First input to the XOR/XNOR logic gate section.
  • XOR In 2— Second input to the XOR/XNOR logic gate section. Receives NOR Out via normalisation when unpatched.
  • XOR Out— Output of the XOR gate. HIGH when exactly one input is HIGH. Normalled to NOT In.
  • XNOR Out— Inverted XOR output. HIGH when both XOR inputs match (both HIGH or both LOW).
  • NOT In— Input to the NOT inverter gate. Receives XOR Out via normalisation when unpatched.
  • NOT Out— Inverted copy of the NOT input. HIGH when input is LOW and vice versa.

How-To Guides

  • Cascading Rhythm Generator
  • CMOS Ring Modulation

Explore the interactive eãs panel on BleepDex — tap any control to learn what it does.

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