Eurorack Reference / modules /noise-engineering/sinc-bucina audit site v0.1 — milestone 3
noise-engineering/sinc-bucina

Sinc Bucina

Noise Engineering

Resonant low-pass gate with variable filter slope, RC envelope generator, and slew. Sequel to Sinclastic Empulatrix, replacing the clamping VCA with a resonant low-pass VCF and VCA combo.458

Capabilities 4

Envelope Generatorenvelope-generator
Internal RC-based DRC envelope generator with Attack and Release controls; envelope available at dedicated output (0 V to 6 V).458
Lowpass Filterlowpass-filter
Two-pole low-pass filter with selectable 6 dB or 12 dB slope, implemented with SSI2164 VCAs.458
Lowpass Gatelowpass-gate
Integrated resonant low-pass VCF and VCA combo forming an LPG. Variable filter slope (6 dB or 12 dB) or VCA-only mode.458
Voltage-Controlled Amplifiervca
A VCA follows the two-pole low-pass filter; all sections use the SSI2164 VCA chip.458

Jacks 5 — 3 in / 2 out

NameSignalVoltageDescription
Inputs (3)
Audio Inaudio—Audio input into the VCF/VCA chain.458
Gatemixed0V to 5VSlew input. Accepts gates (ASR envelope behavior), voltage sequences (slewed), or triggers. Voltage dependent: lower voltage opens VCA/VCF less. True slew limiter — trigger duration must exceed Attack time to fully open VCA/VCF.458
Pingtrigger0V to 5VAmplitude-dependent trigger input. Bypasses the Attack stage; release time set by Release knob. Voltage dependent: lower voltage opens VCA/VCF less; 5 V opens completely.458
Outputs (2)
Audio Outaudio—Audio output from the VCF/VCA chain.458
Envelope Outcv0V to 6VASR envelope output reflecting the internal envelope; 0 V to 6 V depending on Ping/Gate input voltage.458

Parameters 4

NameTypeRangeBehavior
6/0/12switch—Sets the LPG's behavior: resonant 6 dB-slope low-pass filter, no filter (just VCA), or 12 dB-slope low-pass filter.458
Attackknob—Sets the rise time for the slew. The Attack stage is bypassed if a trigger is sent to the Ping input.458
Hitbutton—Momentary button that sends a gate to the Gate input for as long as the button is pressed.458
Releaseknob—Sets the fall time for the slew.458

Firmware history 0 versions

No firmware history recorded.

References 2

  1. [458]
    Noise Engineering Sinc Bucina Manualmanual
    source 458 canonical ↗ archived ↗
    ● verified 2026-05-17
  2. [459]
    Noise Engineering Sinc Bucina product pageproduct_page
    source 459 canonical ↗ archived ↗
    ⚠ verified 2026-05-17 · manufacturer changed since last verified