sinc-bucina

Noise Engineering Sinc Bucina

Resonant low-pass gate with velocity ping and slew

4 HP Eurorack module

Sinc Bucina is a resonant low-pass gate combining a two-pole VCF and VCA with a built-in RC envelope generator and slew limiter. It offers classic west-coast pluck tones via velocity-sensitive Ping input, or complex ASR envelope behavior via the Gate input. The 6/0/12 dB slope switch and resonant filter give it a wide tonal range from transparent gating to singing, harmonically rich textures.

Features

  • Resonant two-pole low-pass filter implemented with SSI2164 VCA chips
  • Switchable filter slope: 6 dB, bypass (VCA only), or 12 dB
  • Velocity/amplitude-sensitive Ping input for expressive dynamic control (0 V to 5 V)
  • Ping input bypasses Attack stage for immediate release-only LPG behavior
  • Gate input acts as true slew limiter with Attack and Release control
  • Gate input accepts gates, triggers, or any CV signal including stepped sequences
  • Separate Attack and Release knobs for full ASR envelope shaping
  • Envelope Out jack exports internal envelope (0 V to 6 V) for external modulation
  • Hit momentary button for hands-on performance without a sequencer
  • RC envelope generator with vactrol-like temporal nonlinearity character
  • Gate input voltage dependent: responds to voltages up to 10 V
  • 4HP compact footprint

Controls & Jacks (11)

  • Gate— Slew input. Accepts gates for ASR envelope behavior or complex signals to be slewed. Rise/fall rates set by Attack/Release knobs. Voltage de
  • Hit— Momentary button that sends a gate to the Gate input for as long as the button is pressed.
  • Audio In— Audio input to the VCF/VCA.
  • Audio Out— Audio output from the VCF/VCA.
  • Release— Sets the fall time for the slew.
  • Envelope— Visual indicator of envelope state.
  • Envelope Out— ASR envelope output. 0-6V depending on Ping/Gate input.
  • Attack— Sets the rise time for the slew. The Attack stage is bypassed if a trigger is sent to the Ping input.
  • Out
  • Ping— Amplitude-dependent trigger input. Bypasses the Attack stage. Release time is set by Release knob. Voltage dependent: 0-5V, with 5V opening
  • Filter Slope— Sets the LPG's behavior: resonant 6 dB-slope low-pass filter, no filter (just VCA), or 12 dB-slope low-pass filter.

How-To Guides

  • Classic West-Coast Pluck
  • Velocity-Sensitive Melodic Sequence
  • Slewed Stepped Sequence
  • ASR Envelope from Gate
  • Envelope as Modulation Source
  • West-Coast Percussion with Complex Oscillator
  • Live Performance Gating with Hit Button
  • CV-Driven Filter Sweep via Gate

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

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