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.
