Arna
A reverb plugin by 1snob · 2026

one knob.
or nine.

Arna is a reverb plugin built on a Differentiable Geometric Feedback Delay Network with brain-driven spectral analysis. The free 1snob edition gives you one knob — turn it and the room grows from a tight, dry corner all the way to an infinite ember. Automate it and you get tape-like, breathing textures by design.

FormatVST3 · AU
PlatformmacOS
EngineDiffGFDN
Free edition1 knob, 1 fader, 1 click
— Premise

reverb plugins are powerful.
most of them are blind.

Most reverbs sit on the bus and apply the same impulse no matter what you feed them. They don't listen. They don't adjust. The result is a room that doesn't belong to the music.

Arna's brain listens to what you feed it — peaks, valleys, transients, sustained content — and shapes the tail with intent. The Journey lives inside one knob: as you turn it, size, decay, tone, and diffusion move together along five honest phases. No menu diving. No cargo-cult. The same knob, automated, becomes the texture itself.

The free edition ships with a single knob and a single fader, plus one click for the journey. The Full edition opens up the same engine across nine knobs, A/B compare, presets, Freeze, MIDI sync. Same DSP source. Same craft.

— The Journey

five spaces.
one knob.

The k value of the 1snob knob traverses a thermometer of five anchor colours, and the sound follows. Behind the knob, the plugin paints the journey live — Brain pulse modulates the bloom intensity at audio rate. You hear what you see.

TightRoomBloomSentientCrown

Read the deep dive on each phase →

tight
k = 0.00 – 0.20

Neutral, dry, controlled. The room is barely there.

room
k = 0.20 – 0.40

Natural, defined. A real space, modest in size.

bloom
k = 0.40 – 0.70

Musical bloom. The tail starts to sing.

sentient
k = 0.70 – 0.90

The plugin's own voice. Not a room — a presence.

crown
k = 0.90 – 1.00

Deep ember, infinite. Ambient territory.

— Three editions

one engine.
three binaries.

The DSP engine in dsp/ is identical across all three. Only the wrapper layer changes. The 1snob edition is free for personal and commercial music production — no nag screen, no watermark, no time limit.

Free · ships now

arna 1snob

$0 USD

One knob, one fader, one click. The single knob drives the full reverb engine — size, decay, tone, and diffusion all move together along the Journey.

  • One knob: the journey from Tight to Crown
  • One fader: dry / wet
  • One click: cycle the colour anchor
  • Brain ring with live ember bloom
  • Free for personal & commercial use
Download
Coming soon

arna full

Paid licence

Nine knobs, A/B compare, presets, Freeze, MIDI keyboard. Same engine — full hands-on control over predelay, reflections, body, decay, bloom, texture, width, tone, and mix.

  • 9 knobs across two rows
  • A/B compare slots (cream + warm)
  • Preset browser with cream halo
  • Freeze (the only blue in the system)
  • MIDI-pitched chord trigger
Read the spec
Internal

arna lab

Not for sale

The calibration rig: 10-tab panel, 100+ faders, 13 visualizers. The instrument used to tune the engine itself — and the source of the reference renders you hear on this page.

  • 10 calibration tabs
  • 100+ exposed parameters
  • 13 specialised visualizers
  • Reference render pipeline
  • For DSP work, not music
— Full mode controls

nine knobs,
one craft.

Every knob renders identically: cream body, copper indicator, no per-knob accent fill. You find a knob by label and position, never by hue. Predictable in low-light or on-stage contexts.

Row 1 — five small knobs (radius 24 px) for time-domain shaping.
Row 2 — four large knobs (radius 34 px) for character and balance.

Read the deep dive on every knob →

Row 1 — time-domain shaping
Predelay

Distance before the room answers.

Early

Level of first reflections.

Body

Mid-tail density.

Decay

Tail length, 0.1 s to 30 s.

Bloom

Late reverb swell.

Row 2 — character & balance
Texture

Algorithmic character of the diffusion.

Width

Stereo image, 0–200%.

Tone

High-frequency damping.

Mix

Dry / wet balance.

— Listen · A/B

dry vs. wet.
same source, same position.

Toggle between the dry source (A) and Arna's rendered tail (B) at any point during playback. Position carries across, so you hear the exact same instant of the take with and without the room.

How to A/B: hit play, then click Dry or Wet to switch sides without losing your spot. Use the scrubber to skip to the part you care about. One pair plays at a time — starting another pair stops the first.

Headphones recommended. Sources: /media dry stems, mp3 96 kbps. Wet rendered through a reference Arna preset matched to each material.

  • PianoBloom preset · 44.1 kHz

    Solo piano figure. Hear the room open up around the attack.

    0:00 0:00
  • DrumsSentient preset · 44.1 kHz

    Acoustic kit. Snare and toms gain depth without losing the hit.

    0:00 0:00
  • Strings staccatoRoom preset · 44.1 kHz

    Short bow strokes. Watch the tail blur the seams between notes.

    0:00 0:00
  • Female vocal — pepelalaCrown preset · 44.1 kHz

    Sustained vocal line. Crown phase: the voice grows its own halo.

    0:00 0:00
— Full edition

the plugin window, top to bottom.

Arna plugin mockup, full mode — header, visualizer, two rows of knobs, mode buttons, MIDI display, brain strip
— Built to ship

specs.

Validated through pluginval Level 10, a custom torture battery, and ctest before any release. The engine never allocates on the audio thread.

Engine
DiffGFDN · brain-driven spectral analysis
Formats
VST3 · AU
Platform
macOS 12+ · Apple Silicon + Intel
Built with
C++20 · JUCE 8.0.6
Validated by
pluginval Level 10 · ctest · torture battery
Window
800 × 600 px (1snob) · resizable in Full
Sample rates
44.1 / 48 / 88.2 / 96 / 176.4 / 192 kHz
Block sizes
32 to 2048 samples
Latency
Zero added (lookahead off)
— Quick answers

before you ask.

Is the 1snob edition really free?

Yes. Free for personal and commercial music production, with no time limit, no watermark, and no nag screen. The Full edition is paid (not yet available) and uses the same engine.

Will there be a Windows build?

Not at launch. Arna is built on JUCE 8 and the engine is portable, but our validation gate runs on macOS only. A Windows build is on the wishlist after Full ships.

Why orange and cream?

Two colours that survive bad monitors, on-stage lights, and screenshots. Cream as the universal "lit" signal, orange as the field. The two cold colours in the system — iceBlue for Freeze, coral for destructive actions — are earned, not decorative.

What does "DiffGFDN" mean?

Differentiable Geometric Feedback Delay Network. A reverb topology where the routing is geometric (rooms model real spatial behaviour) and the parameters are differentiable, so we can train them end-to-end against target impulse responses.

Can I use Arna on a commercial release?

Yes — the 1snob edition is free for personal and commercial music production. No additional licence required. Credit appreciated, never demanded.

Full FAQ

arna

built to be turned.

Download the free edition and find the room. Get on the list to be first when Full ships.

Download 1snob Get on the Full list