Eurorack Reference

Acid Rain Technology / acid-rain-technology/ziggurat

Ziggurat

4-channel performance quantizer that turns any combination of CV and gate signals into pitch voltages, with per-channel note mask, offset, root, range, slew, and chain sequencing. [30]

Specifications

HP
14
Depth
25 mm
+12V
90 mA
−12V
10 mA
+5V
0 mA
Last verified
2026-05-02

Capabilities

  • CV Sequencer (Chain) cv-sequencer
    Chain mode allows entering up to 32 notes in sequence. Gate input steps through notes in order; CV input moves through them in either direction. [30]
  • Quantizer quantizer
    4-channel precision quantizer with per-channel configurable note mask (12-note keyboard), root, offset, range, and slew. Channels can be linked for simultaneous editing. [30]
  • Random CV Generation random-cv
    With only a gate input and no CV input, Ziggurat generates a random value on each gate rising edge and feeds it through the quantizer. [30]
  • Sample and Hold sample-and-hold
    When both CV and gate inputs are patched, Ziggurat samples and holds the CV input on each gate rising edge before feeding through the quantizer. [30]

Jacks (4)

Inputs (3)

NameSignalVoltageDescription
Channel CV Inputs cv -8V to 8V Precision calibrated CV inputs, accepting -8V to +8V. Will respond into audio rate though results may be noisy. Primarily designed for sub audio frequency signals. [30]
Channel Gate Inputs gate — Will detect any signal rising above 0.7V as the rising edge of a gate. Audio rate signals may be used with noisy results. [30]
Mod CV Input cv -8V to 8V Assignable modulation CV input accepting -8V to +8V. Can be assigned to modulate offset, chain reset, range, slew, root, or load (patch recall) across any combination of channels. [30]

Outputs (1)

NameSignalVoltageDescription
Channel Outputs cv -4V to 7.916V Precision calibrated 1V/oct pitch outputs. Output voltages from -4V to +7.916V (twelve octaves). Changes in output voltage occur with a 2ms delay from input voltages and gates. [30]

Parameters (10)

NameTypeRangeMin FWBehavior
Chain button ≤32 — Enter a sequence of up to 32 notes to feed into the quantizer. Gate input steps through notes in order; CV input (0-5V) moves through notes in either direction. Press offset button to undo last note. Press chain button twice to clear. [30]
Channel Buttons button — — Selects which of the 4 channels to edit. Multiple buttons held for 1 second links channels together, copying settings from the first pressed. Hold one linked channel button for 1 second to unlink. [30]
Load button — — [30]
Mod button — — Assigns the Mod CV input to dynamically modulate one of: Offset (1V/oct, -8V to +8V), Chain reset (>1V trigger), Range (0-5V), Slew (0-5V), Root (1V/oct, -8V to +8V), or Load (1V/oct, 0-3V for 35 save slots). Applied to all 4 channels by default; individual channels can be deselected. [30]
Note Mask button — — 12 buttons representing a musical keyboard (C at bottom, B at top). Individual notes can be toggled on/off to set the scale that incoming CV is quantized to. [30]
Offset button — — Applies a semitone voltage offset to the input signal before the quantizer. Press offset button and select a note on the keyboard. Hold range button inside offset menu to add additional whole octave offsets. [30]
Range button — — Sets the octave range of the quantizer output. Press range button then select lower and upper bounds on the note mask keyboard. Voltages outside the range wrap to the opposite end. [30]
Root button — — Applies a semitone voltage offset after the quantizer to change the key/root note of the channel output. Press root button and select a note on the keyboard. [30]
Save button — — Press save button to enter save menu. 35 save slots organized as 5 banks of 7. Select bank then slot to save and exit. Module also autosaves any changes as they are made (separate location), so settings persist across power cycles. [30]
Slew button — — Select individual notes to apply slew to. Press and hold slew button to set slew time via the right column of buttons: 50ms, 100ms, 300ms, 750ms, 1.5s, 3s, 5s. The same slew time applies to all slewable notes on a given channel. [30]

Firmware history (0 versions)

No firmware history recorded.

References (2)