A chorus with no LFOs. Underneath is a flock of 748 boids, wheeling in real time — and that murmuration IS the modulator. The voices move like starlings at dusk, so the stereo picture breathes, drifts, and never once repeats itself.
A normal chorus wobbles its voices with an LFO — a sine, a triangle, the same shape looping forever. Your ear learns the cycle in seconds. Murmur throws the LFO out. It runs a boids flocking simulation: 748 agents each steering by cohesion, alignment, and separation, and the first 16 of them are the chorus voices you hear. Their height sets each voice's delay time; their side-to-side position sets its pan. The result is modulation that's alive — never a loop, never the same pass twice.
748 boids obey cohesion, alignment and separation every sample. The first 16 are audible chorus taps — y becomes delay time, x becomes pan. There is no LFO anywhere in the signal path. The movement emerges from the swarm.
An LFO chorus is periodic by definition — the shimmer comes back on a clock. A flock is chaotic in the mathematical sense. Two passes of the same part get two different modulations, so pads and rhodes and vocals stop sounding stamped-out.
Drag on the bell-jar's LED screen and the whole murmuration settles to that point — tight in one corner, wide across the top. The birds hold the spot and only slip the leash as you push CHAOS. The XY target IS the sound.
Fast dives and hard turns in the flock add a touch of flutter and a whisper of ring-mod on the way down — the way a real murmuration shivers when it banks. It's baked into the boids, not a separate effect you dial in.
No rate knob, no shape menu, no sync division to fight. The only "speed" is how tightly the flock holds together, and that lives under one control. Less to set, more that's alive.
Organized by how the flock behaves: DRIFT for slow migrations, SWARM for a tight iron murmuration, SCATTER for a panicked sky, PERCH and ORBIT for parked hovers, plus DEPTHS and HAUNT. Load one, hit play, then drag the jar and make it yours.
No LFO section means no LFO clutter. You shape the flock, not a waveform, and there are only four ways to do it.
Cohesion and alignment. Low is a loose, drifting cloud; high pulls the voices into one tight ensemble moving as a single mind.
Random steering injected per bird — jitter, panic, scatter. Nudge it for life; crank it and the flock breaks formation entirely.
How much sky the flock's height spans — the width of the delay-time band. Small for a subtle thickening, wide for deep, seasick ensemble.
Equal-power dry/wet. Ships cranked to full wet on a fresh instance, because that's how you hear what the flock is doing.
The flock lives inside a glass jar and you watch it move while you work — settling when it's calm, boiling when CHAOS is up. Drag the LED screen to steer where it parks. It's the rare plugin GUI that tells you what the sound is doing before you even hit play.
VST3 / AU · drop it on any track in your DAW.
The ensemble and chorus plugins people love are great. Every one of them is still driven by an LFO.
LFO-driven
three fixed LFOs
still just waveforms
or the whole catalog for $100
Typical category prices, 2026. We just think a chorus should move like something alive.
AU + VST3 — drop it in and go. If your DAW loads plugins, it loads this one.
Murmur is $49.99, one time, yours forever. Or take the whole Ghost Audio catalog for $149.99 ($100 while we're in launch). No subscriptions, no fake sales.
Any DAW that loads VST3 or AU: Ableton Live, Logic Pro, FL Studio, Cubase, Studio One, Reaper, Bitwig, and more. Not Pro Tools: Pro Tools only loads AAX plugins, and we do not make an AAX build.
Yes — at launch, every paid pedal gets a free 10-day demo that's the full plugin, not a crippled teaser. Join the list below and you'll get it first.
No dongles, no always-online check. Install it on any computer you work on.
A normal chorus uses an LFO — a repeating waveform — to move its voices, so the shimmer loops on a clock. Murmur replaces the LFO with a 748-agent boids flocking simulation. The first 16 boids are the chorus voices, their height sets each voice's delay and their position sets its pan, and because a flock is chaotic it never repeats the same pass twice. That "alive" motion is the whole product.
FLOCK sets how tightly the birds hold together (loose cloud to single mind), CHAOS injects random steering (jitter to full scatter), DEPTH sets how wide the delay-time band spans, and MIX is an equal-power dry/wet. You also drag the LED screen to park the flock wherever you want it in the stereo field.
Try the free 10-day demo first — it's the full plugin, so you can hear exactly what you're buying. All sales are final after that, and if something's ever broken on our end, we'll make it right.
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