Sabol Hill Lacuna [WiN]

• Product: Lacuna
• Developer: Sabol Hill
• Version: 1.0.0
• Format: VST3
• Requirements: Windows 7.1 or later
• Source: sabolhill.com/lacuna

Lacuna is a four-band saturation and stereo animation plugin built around CURRENT — a dual-mono stochastic spectral drift engine that evolves the left and right channels independently on a continuous stochastic basis, generating movement and stereo separation that doesn’t null with itself and doesn’t shift the source’s tonal center. Per-band controls include TAPE, TUBE, and TRANS saturation modes, DRIFT (dual-mono band center frequency offset), and LEAN (per-band channel favoring without hard panning). Three global box tone presets — INFRA, TERRA, SUPRA — apply fixed under-the-hood EQ curves. The saturation stage runs at 2× oversampling internally. It answers the query: how do I add analog-style movement, width, and harmonic character to a static digital source without using a hardware emulation or conventional stereo widener.

Key Takeaway

Static digital sources in an otherwise dense mix — pad layers that sit flat, sub mixes that don’t separate despite EQ, synth leads that lack physical presence — are the activation context for Lacuna. CURRENT operates continuously without automation input, displacing the need to manually draw width or motion into a source after the fact. CURRENT’s stochastic behavior is not deterministic; sessions requiring exact phase recall or mix comparison at the sample level will find the continuously evolving signal incompatible with that workflow. Engineers who already own a hardware analog chain for their key sources, and whose digital sources are deliberately static, don’t have the problem Lacuna is built to solve.

CURRENT: Stochastic Drift as a Per-Band Parameter

CURRENT applies dual-mono stochastic spectral drift — continuous, randomized spectral evolution that runs differently on the left channel than the right. The drift operates independently per band, so low-frequency CURRENT behaves on a different stochastic trajectory than the high-frequency band running simultaneously. Because the left and right channels evolve on separate stochastic paths, the signal never nulls with itself in mono — the drift creates stereo difference content that is genuinely asymmetric rather than generated from a static offset.

The developer’s framing is that stochastic spectral drift is the physical mechanism behind analog gear’s perceived width and separation, reproduced here as a controllable software parameter rather than a byproduct of hardware variance. DSP credit goes to Jatin Chowdhury, whose prior work includes ChowDSP and several widely used open-source processing tools. In practice, early users report that CURRENT adds width and spatial dimension without sounding processed or panned, and that it remains mono-compatible — the stereo difference content is perceptually additive rather than phase-destructive.

The stochastic basis means CURRENT’s output is never the same twice. A bounced render and a live playback of the same session produce different stereo movement from CURRENT, which affects stems-first workflows where printed audio needs to match a reference pass exactly.

TAPE, TUBE, TRANS: Three Saturation Models, Four Bands

TAPE, TUBE, and TRANS apply independently per band with their own depth controls, which means the low band can run TAPE saturation at moderate depth while the high band runs TRANS at a different setting. The three models represent distinct harmonic signatures — TAPE adds even-order harmonic softening consistent with magnetic saturation; TUBE introduces asymmetric even-harmonic distortion; TRANS covers transformer-style transient saturation that emphasizes odd harmonic content.

Saturation depth per band is separate from CURRENT, so harmonic intensity and spatial evolution are independent decisions rather than a coupled control. HYPER MODE doubles the saturation drive globally across all bands simultaneously — it operates at the circuit level rather than adding gain before the saturators, which changes the saturation character rather than simply increasing the existing harmonic content.

The saturation stage runs at 2× oversampling internally, which reduces aliasing artifacts at high drive levels and keeps the harmonic content clean at the top of the drive range. Gain link between input and output allows the saturation circuit to be driven harder without the louder-is-better bias interfering with the comparison.

DRIFT, LEAN, and Band-Level Stereo Tools

DRIFT offsets each band’s center frequency differently between the left and right channels, creating dual-mono frequency displacement that adds width and dimension within that band’s range. LEAN toggles between L, R, or off per band, favoring one channel without hard-panning — a band set to L-lean sits slightly left in the field while remaining present in both channels.

DRIFT and LEAN operate independently from CURRENT and from each other, which means a band can run CURRENT, DRIFT, and LEAN simultaneously or in any combination. The interaction between CURRENT’s stochastic movement and DRIFT’s static frequency offset produces a band that evolves within an already-widened spectral space, compounding the stereo separation effect at that frequency region.

Neither DRIFT nor LEAN expose numerical values or specific frequency offset amounts — they are on/off controls with fixed behavior per band. Engineers who need precise stereo width measurements or specific channel gain values for compliance with loudness or stereo width targets will need a dedicated metering tool running in parallel.

INFRA, TERRA, SUPRA and the Box Tone Layer

The three character presets apply fixed EQ curves under the hood without exposing the curve parameters to the user. INFRA produces a dark, low-frequency-weighted tonal character; TERRA applies a balanced midrange emphasis described as hype; SUPRA adds high-frequency airiness and presence. All three can be deactivated entirely, leaving only the saturation, CURRENT, DRIFT, and LEAN processing active.

The hidden EQ approach means the box tone colors can’t be adjusted — INFRA’s low-end weighting is either on or off at its fixed amount. Engineers who need precise tonal control of the box tone layer will find the three-preset system too coarse for sources where the EQ balance matters at the dB level.

The SURGICAL filters target the boxy and harsh frequency regions specifically, with PRE or POST placement relative to the saturation circuit. Pre-placement shapes the signal before harmonic content is generated; post-placement attenuates resonances that appear as a result of the saturation processing.

No Automation Reset and the Stochastic Output Floor

CURRENT’s stochastic behavior removes it from workflows requiring exact phase recall, sample-accurate mix comparison, or deterministic stem printing. A mix engineer doing A/B comparison between two passes of a mix through Lacuna will hear different CURRENT behavior on each pass regardless of identical plugin settings.

Early user reports from Gearspace confirm several control ergonomics gaps: no double-click or option-click to reset parameters to default, the preset selection window stays open after a preset is chosen, and pressing Escape dismisses the entire plugin window rather than closing the preset browser. These are workflow friction points on sessions where rapid parameter comparison or preset browsing is part of the process.

The four-band architecture has fixed band ranges with moveable boundary points via the volume sliders in the animation window, but does not expose precise crossover frequency values numerically. Sessions requiring crossover placement at a specific Hz value for surgical spectral separation need a full parametric multiband processor alongside Lacuna.

FAQs