Acid Rain Technology Ziggurat

Name: Ziggurat
Brand: Acid Rain Technology

14 HP Eurorack module

Ziggurat is a four-channel Eurorack pitch quantizer that turns external CV, sampled CV, gates, random values, or entered note chains into musical pitch voltages.

Features

Four independently editable channels quantize incoming voltages to enabled notes.
Hold multiple channel buttons for 0.5 second to link their parameter editing; the first channel’s settings are copied to the other channels. Hold one linked channel for 0.5 second to unlink the group.
With CV and gate connected, each rising gate samples the CV before quantization. With only a gate connected, each rising edge generates a random input value.
An unpatched channel behaves as though its CV input is 0 V. With CV alone, the channel quantizes continuously as voltage thresholds are crossed.
Range confines the output to selected octaves, wrapping values that fall outside the range to the opposite end.
Slew can be enabled per note; one shared slew time applies to all slew-enabled notes on a channel or linked group.
Offset transposes before quantization, while Root applies a semitone offset after quantization to change the musical key.
Chain accepts a sequence of up to 32 notes at the quantizer input and previews notes at the output during entry. An applied chain cannot be edited.
The Mod input can be assigned to functions and routed per channel; all four channels are selected by default in the Mod menu.
With Chain selected as the Mod destination, crossing 1 V resets an applied chain or the repeatable random-voltage string produced in gate-only operation.
With Load selected as the Mod destination, a 1 V/oct signal from 0 V to 3 V addresses the 35 preset slots across 36 semitone voltages.
Changes are also autosaved separately and restored after power cycling.

Controls & Jacks (37)

C Note— Enables or disables C in the active channel's quantizer note mask.
F Note— Enables or disables F in the active channel's quantizer note mask.
A Note— Enables or disables A in the active channel's quantizer note mask.
Root— Enters or exits root editing, where a note key selects a post-quantizer semitone offset and therefore changes the channel's musical key.
Load— Opens the load menu; the keyboard selects one of five banks and one of seven slots, immediately recalling one of 35 saved configurations.
D Note— Enables or disables D in the active channel's quantizer note mask.
G Note— Enables or disables G in the active channel's quantizer note mask.
E Note— Enables or disables E in the active channel's quantizer note mask.
Mod— Enters or exits modulation assignment; note keys choose the Mod input destination and channel buttons choose which channels receive modulati
Offset— Enters or exits pre-quantizer offset editing, where a note key selects the semitone offset.
Channel 2 Select— Selects Channel 2 for editing; its illumination indicates selection and is also used in the Mod menu to show whether modulation applies to t
Save— Opens the save menu; the keyboard selects one of five banks and one of seven slots, saving the current settings into one of 35 locations.
F# Note— Enables or disables F-sharp in the active channel's quantizer note mask.
Channel 3 Select— Selects Channel 3 for editing; its illumination indicates selection and is also used in the Mod menu to show whether modulation applies to t
B Note— Enables or disables B in the active channel's quantizer note mask.
Channel 1 Select— Selects Channel 1 for editing; its illumination indicates selection and is also used in the Mod menu to show whether modulation applies to t
Slew— Enters or exits slew editing, where note keys select which quantized notes glide to their target voltage.
A# Note— Enables or disables A-sharp in the active channel's quantizer note mask.
D# Note— Enables or disables D-sharp in the active channel's quantizer note mask.
Chain— Enters chain construction for a sequence of up to 32 notes, applies it when pressed again, or clears an existing chain when the menu is ente
G# Note— Enables or disables G-sharp in the active channel's quantizer note mask.
Channel 4 Gate Input— Accepts rising edges above approximately 0.7 V to sample the channel CV input, or to generate random values when no CV input is connected.
Channel 4 Select— Selects Channel 4 for editing; its illumination indicates selection and is also used in the Mod menu to show whether modulation applies to t
Channel 2 Gate Input— Accepts rising edges above approximately 0.7 V to sample the channel CV input, or to generate random values when no CV input is connected.
C# Note— Enables or disables C-sharp in the active channel's quantizer note mask.
Mod Input— Accepts modulation from -8 V to +8 V for the selected destination and channels: pre-quantizer offset, chain or random reset, range, slew, po
Channel 3 Gate Input— Accepts rising edges above approximately 0.7 V to sample the channel CV input, or to generate random values when no CV input is connected.
Channel 1 Gate Input— Accepts rising edges above approximately 0.7 V to sample the channel CV input, or to generate random values when no CV input is connected.
Range— Enters or exits range editing; two note-key presses set the lower and upper octave limits, and voltages outside the range wrap to the opposi
Channel 2 CV Input— Accepts a -8 V to +8 V signal for quantization; when the corresponding gate input is connected, its value is sampled on each rising gate edg
Channel 1 Output— Outputs Channel 1's quantized 1 V/oct pitch signal over a -4 V to +7.916 V range.
Channel 2 Output— Outputs Channel 2's quantized 1 V/oct pitch signal over a -4 V to +7.916 V range.
Channel 4 Output— Outputs Channel 4's quantized 1 V/oct pitch signal over a -4 V to +7.916 V range.
Channel 1 CV Input— Accepts a -8 V to +8 V signal for quantization; when the corresponding gate input is connected, its value is sampled on each rising gate edg
Channel 3 CV Input— Accepts a -8 V to +8 V signal for quantization; when the corresponding gate input is connected, its value is sampled on each rising gate edg
Channel 3 Output— Outputs Channel 3's quantized 1 V/oct pitch signal over a -4 V to +7.916 V range.
Channel 4 CV Input— Accepts a -8 V to +8 V signal for quantization; when the corresponding gate input is connected, its value is sampled on each rising gate edg

How-To Guides

Set the Output Range
Set the Pre-Quantizer Offset
Configure Note Slew
Set the Root Offset
Build a Note Chain
Clear a Note Chain
Save a Preset
Load a Preset

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