Rebel Technology — Stoicheia

Manual PDF

Stoicheia (Στοιχεῖα) Eurorack Module Manual

Stoicheia: Concise Cheat Sheet

Quick Start

Connect Clock IN A/B: Plug an LFO or clock into the left/right bottom jack(s).
Connect OUT A/B: Connect left/right OUT jack to your drum or gate-enabled modules.
Middle Switch (both rows): Center for OFF, UP for Trigger, DOWN for Alternating (see Modes).
Set Knobs:
Bottom: Fills (# of gates per pattern, CCW=1, Center=50%, CW=all)
Middle: Length (steps, 1–16, center=8)
Top: Rotation (start position; left/right rotates sequence)

Panel Controls

Jacks

OUT A/B (top left/right jacks): Rhythmic gate outputs
Low: 0V, High: 5.1V
Impedance: < 1.1kΩ
RESET (middle jack): Trigger resets both sequences to their start position.
Input: > 100kΩ
CLOCK A/B IN (bottom left/right): Clock/trigger for left/right sequence.
Input: > 100kΩ

Knobs (each sequence, left/right columns)

Top (Rotation): Step offset/rotation of sequence start
Middle (Length): 1–16 steps, center=8
Bottom (Fills): Number of "on" steps (gates), 1–length, center=half, CW=max

Switches

Sequence Switch (each sequence, 3-way):
UP: Trigger mode—output follows input clock edges, pulse width matches clock
CENTER: Off
DOWN: Alternating/Tied mode—output toggles, holding high until next on-beat
Chained Mode: Center switch down enables chaining (A then B, outputs merged)

Modes

Trigger Mode: Gate outputs follow the input clock width (UP position)
Alternating Mode: Output toggles on each on-beat (DOWN position)
Chained Mode: Both sequences run consecutively (via center switch DOWN)

Patterns

E(x,y): x fills, y steps, auto-Euclidean distribution
Example: E(3,4) = [x . x x] (Calypso)
E(2,5): [x . x . .] (Take Five, Tchaikovsky)
E(5,8): [x . x x . x x .] (Cuban cinquillo, Persian)
E(7,12): [x . x x . x x . x . x .]
E(9,16): [x . x x . x . x x . x . x . x .]

Voltage/Current Specs

Power: +12V <10mA, +5V <25mA, -12V 0mA
Output range: 0V (low), 5.1V (high)

Reference

Hacking / Open Hardware

MCU: ATMega168 (Arduino bootloader, FTDI compatible)
Firmware: Open source, see repo

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