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Modulation · Dual 6-stage optical phaser · Free with signup · AU · VST3 · macOS

Two phasers. Infinite swirl.

DuoPhase brings the legendary dual-phaser architecture of the 1970s to your DAW: two independent 6-stage optical phasers that run alone, cascade in series for deep 12-stage swirls, or split into a wide parallel stereo field — all driven by two free-running or tempo-synced sweep generators.

Sign up — get DuoPhase free The sound →
Phasers2 × 6-stage optical
Sweep gens2 · 0.05–12 Hz · sync
RoutingsA · B · Series · Parallel
PriceFree with signup
DuoPhase · Dual Optical Phaser
DuoPhase interface — two optical phaser sections, dual sweep generators, and master routing
01 / The sound

The swirl behind countless records.

Phase shifting is one of the most recorded effects in music history. From the moment optical phasers appeared in the early seventies they became a fixture of the studio and the stage — that slow, liquid swirl all over classic-rock rhythm guitar, the throb behind psychedelic and blues-rock leads, the shimmer on Rhodes and Clavinet in seventies funk and soul, and the wide, watery motion running through prog, reggae, dub, and early synth records. Decades later the same swirl drives shoegaze washes, neo-soul keys, and modern synthwave pads. The dual-phaser design DuoPhase recreates was the deepest of them all — because two phasers moving at once do what no single phaser can: the sweeps interact, drift, and breathe.

Why optical matters

Lamp & photocell lag

The original circuits swept the phase stages with lamps and photocells. Photocells don’t move instantly — they lag, rounding every sweep into something organic. DuoPhase models that behavior, so even a square-wave LFO becomes a soft, pulsing throb instead of a hard chop.

02 / Features

Everything moving at once.

Dual phasers

Two 6-stage optical engines

Each phaser has its own Depth, Feedback, and Normal / Reverse sweep — run one, or push both for a 12-stage cascade.

Sweep generators

Two, fully assignable

Sine or square, 0.05–12 Hz, free-running or host-synced — assign either generator to either phaser for interacting, drifting motion.

Routings

Four ways to move

Phaser A, Phaser B, Series A→B for depth, or Parallel Stereo for a wide, watery field across the mix.

Tempo sync

Locked to the grid

Per-generator sync from 1/1 to 1/16 — dotted and triplet — for rhythmic, square-wave phasing that pulses in time.

Optical modeling

Authentic lag

Photocell-lag modeling smooths every sweep, turning even a hard square LFO into a soft, breathing throb.

Presets

Guitar & synth ready

Slow swirls, Leslie-style ramps, vibe throbs, ocean pads, and synced square chops — starting points for guitars, keys, and stems.

04 / At a glance

The specs.

2
Optical phasers
6stage
Per phaser
0.05–12Hz
Sweep range
4
Routings
Sine·Sqr
Waveforms
1/1–1/16
Tempo sync
AU·VST3
Formats
macOS
Platform
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DuoPhase

Dual 6-stage optical phaser with two sweep generators. Deep 12-stage series swirls or wide parallel stereo motion.

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FORMATS
AU · VST3 · Standalone app
ARCHITECTURE
Universal — Apple Silicon and IntelAPPLE M-SERIES RECOMMENDED
SECURITY
Signed and notarised by Apple
REQUIRES
macOS 10.13

DuoPhase is an original Dreamlab Digital Media product. It is not affiliated with, endorsed by, or derived from any hardware or software manufacturer. Full licence terms at dreamlabnet.com/daw2/eula.html.