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Circuit Atlas · HUSH M4 · Rev 2027.4 draft

S11 Texture (optional)

Schematic for S11 Texture (optional). Design targets and calculations, no measurements.

IN DEVELOPMENT · REV 2027.4 (DRAFT) · DESIGN TARGETS, NOT MEASUREMENTS

HUSH M4 is in development. This draft is published on zakkhutoretsky.com; it has no price and no ordering. Figures marked design target are goals for the finished product. Figures marked calculated come from the published formulas. No value on these pages was measured on a built unit. Interviews are cited as the design brief, not as an endorsement.

See this control Texture on the playable panel

S11 Texture (optional)

Texture optionsTwo design-target ways to add texture after the channel filter: an analogue four-pole ladder or OTA filter with drive, and a digital texture card. A relay takes the texture out of the path when it is off.S11 TEXTURE — analogue ladder / OTA option and DSP card, design targetsS4 OUTRelay K2texture in / outA Analogue ladder / OTAdrive, 4-pole, resonance, cutoff CVB DSP texture cardADC, DSP, DACMode selectone of A / Bto faderWhen texture is off K2 routes S4 OUT directly to the fader: the path is the analogue strip of S1–S9 and no converteris in it.A. Four-pole ladder: Stilson and Smith analyse the Moog voltage-controlled filter (24 dB per octave, resonance byfeedback); Huovilainen adds the non-linear model.B. DSP card: modes Clean SVF, Ladder (zero-delay-feedback form, after Zavalishin), Comb and Bitcrush, 4× oversampled,with drive before the filter,resonance, and LFO or envelope-follower modulation of the cutoff. The browser model on /mixer runs this signal flow inan AudioWorklet.Controls: TEXTURE knob (amount; zero is off), MODE button with LED, and per-channel assign in the full design. Formantand Noise / air modes are not part of this revision.Design target. Nothing here has been built or measured.
S11 Texture (optional) (schematic) Swipe sideways to pan on a phone.
ItemValue / formula
PlacementAfter S4, before the fader, switched by relay K2. Off is the analogue strip with no converter in it
Option A, analogueFour-pole ladder or OTA filter with a drive stage in front, resonance by feedback, 24 dB per octave. The Moog ladder is analysed by Stilson and SmithR17 and modelled non-linearly by HuovilainenR18. Component values are not set in this draft
Option B, DSP cardADC, DSP and DAC per strip or shared and assignable. Modes: Clean SVF, Ladder (zero-delay-feedback form, after ZavalishinR19), Comb, Bitcrush; 4× oversampled (2× in the efficient mode); drive before the filter; resonance; LFO or envelope-follower modulation of the cutoff. Latency in the browser model: 51 samples
ControlsTEXTURE knob (amount; zero is off), MODE button with LED. The same signal flow runs in the browser model on /mixer
Not part of this revisionFormant and Noise / air modes

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