Euclid
Euclid: main parameter page.
A stereo Euclidean modulation effect. A rhythm of 1–64 steps (evenly spaced in the cycle) drives one of five destinations: low-pass, band-pass, high-pass, notch, or amplitude. The rhythm follows the Octatrack transport, track speed and swing grid, keeps rolling across pattern loops, and PLAY resets its phase.
Access
An effect on a track: select the track, press FX1 or FX2, and pick EUCLID from the chooser. In Octabam Inserts only.
Operation
- STEPS is the cycle length, PULSE how many pulses land in it (limited to STEPS). DEPTH is bipolar: centre leaves the destination static, positive values raise it on a pulse, negative lower it.
- TYPE picks LP, BP, HP, AMP or NOTCH. In AMP the panel renames FREQ/RES/DEPTH to LEVEL/--/AMT; the filter types restore the original names.
- OUT selects what a pulse does:
- ENV: retriggers an attack and curved decay (ATK up to one step, DEC up to eight).
- GATE: opens the destination for LEN (1/128 to one step), with EDGE smoothing both transitions.
- RAND: each pulse chooses and holds a new level; SLEW controls the transition, up to one step.
- LOOP: freezes the last random value heard at every position; returning to RAND resumes generation.
- RATE is relative to track speed: 1/32, 1/16, 1/8, 1/4 or 1/2. 1/16 is one track step.
- ROT shifts the rhythm (and any captured values) right.
- MIX 0 is an exact dry passthrough. Zero pulses and STOP return to the base cutoff or gain.
Parameters
| Page | Knob | What it does |
|---|---|---|
| Main | FREQ | base cutoff (LP/BP/HP/NOTCH); base gain (AMP) |
| Main | RES | resonance for the four filters; inert for AMP |
| Main | DEPTH | bipolar pulse depth: + up, - down, centre static |
| Main | DEC / LEN | ENV decay (up to 8 steps) / GATE length |
| Main | STEPS | rhythm cycle length, 1–64 |
| Main | PULSE | pulses per cycle, 0–64 (limited to STEPS) |
| Setup | ROT | shift the rhythm right |
| Setup | RATE | 1/32, 1/16, 1/8, 1/4, 1/2 of track speed |
| Setup | TYPE | LP, BP, HP, AMP, NOTCH |
| Setup | ATK / EDGE / SLEW | per OUT mode: ENV attack, GATE edge smoothing, RAND transition |
| Setup | OUT mode | ENV, GATE, RAND, LOOP |
| Setup | MIX | dry/wet; 0 is an exact dry passthrough |
Screen Reference
Euclid: effect selection and setup parameters.
Status: on hardware: cursory testing on Sam's MKII (owner report, 16 Oct 2026); its own render gates.
Module facts (developers)
Euclidean LP/BP/HP/notch/amp sequencer: swing, envelope, gate, random and loop.
| Detail | Value |
|---|---|
| Author | repeat98 |
| Category | Effects: on a track |
| Kind | hybrid |
| Test status | on hardware: cursory testing on Sam's MKII (owner report, 16 Oct 2026); its own render gates |
| FX2 ID | 0x1d |
| Parameters | FREQ@0, RES@1, DEPTH@2, DECAY@3, STEPS@4, PULSE@5, ROT@6, RATE@7, TYPE@8, ATK@9, OUT@10, MIX@11 |
| Included in | octabam-inserts |
On GitHub: https://github.com/sambanks/octabam/blob/main/modules/euclid/README.md