Gravitroid

Tape Through-Zero Flanger.
The Real Jet-Plane Flange.

$9 Price

3 Platforms

VST3 + AU on macOS

Gravitroid

$9. Perpetual license. Three activations.

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Two Engines. Three Modes. One Zero Crossing.

Most flangers sweep a short positive delay and call it a day.

Gravitroid runs two real engines - Tape for the classic positive flange, Through-Zero for a delay that genuinely crosses zero and collapses the comb completely. Run either alone, or run them in series as I+II and the two combs multiply into the thickest sweep in the catalog. Watch every crossing happen live on the red phosphor phase scope.

Bipolar feedback, tempo sync, and 20 factory presets.

$9.

Broadcast Foundry $19

Howdy Compressor $19

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Watch the Sweep Collapse Through Center.

Dial Manual to zero and run the Through-Zero engine - the red phosphor phase scope twists and collapses right on the panel every time the delay crosses true zero.

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Two Engines, Not One

Tape Glides. Through-Zero Collapses.

Tape (Engine I) is the classic positive flange - an exponential sweep that glides evenly through the octaves with no stall at the ends. Through-Zero (Engine II) sweeps a delay that actually crosses zero, so the comb filter fully collapses and reappears, the effect real jet-plane flanging is named for. I+II runs them in series: the two combs multiply into a dense crossing lattice, the thickest setting in the catalog.

Mode - I (Tape) / II (Through-Zero) / I+II (series)
Manual - offsets the sweep center, true-zero at 12 o'clock
Feedback - bipolar, Jet/Hollow to Metal

The Mad Scientist Moment

A Live Red Phosphor Phase Scope.

A Lissajous trace of the stereo signal draws right on the panel, with a short phosphor decay so the trace glows rather than vanishing frame to frame. Every time the Through-Zero engine's delay crosses center, watch the trace twist and collapse in real time - the sweep made visible, not just audible.

Phase scope - live Lissajous trace, red phosphor decay
Sync - locks Rate to host tempo
Channels - Stereo (90-degree offset sweeps) or Mono

20 Places to Start

From Subtle Doubling to Full Jet Dives.

Classic guitar flange, drum bus sweeps, a subtle doubler-adjacent setting, full through-zero jet dives, and self-oscillating high-feedback extremes - real starting points built from the actual controls, not presets that only work at factory settings.