Evolving space reverb
Amanita Ocean is an algorithmic reverb designed as a living space. Its tail breathes, changes colour and makes room for the sound that created it—without turning into an obvious chorus.
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New in 0.21
Ocean 0.21 introduces Current: eight FDN lines moving as parts of one coherent liquid volume. Decay now grows without pulling back the first reflection, while Lateral Decay lets the space open around a stable mono core.
A shared rank-2 field moves delay offset, damping and the full L/R position of every line. The motion has one fluid cause, instead of eight unrelated LFOs or an output chorus.
The visual field uses the same Current geometry and flow law as the DSP, so the background echoes movement inside the tail.
Decay remains a pure feedback-time control: no decay-linked compensation turns the FDN input down. Longer settings preserve the first Wet return and build density naturally inside the tail.
Width and Evolution can extend the lateral group of FDN lines without shortening the central mono core. The space unfolds around the source without a new control or output Side boost.
Five currents, one ocean
Every character reshapes the same stable reverb core. Switching characters morphs over 200 ms, so the existing tail is never reset.
The reference space
Default preserves the attack, then opens into a balanced, highly decorrelated field. Extremely slow fractional-delay motion keeps long decays alive without announcing itself as pitch modulation.
Reflections that rise
Later reflections arrive with more weight, creating a reverse-like swell before a second stereo diffusion field dissolves the shape. It is causal, continuous and free from grains or reversed buffers.
Movement inside the tail
Drift moves spectral regions inside the feedback network, rather than chorusing the output. Left and right follow related but independent trajectories while common delay motion stays below 0.10 ms to keep the low end anchored.
Transients become atmosphere
Veil reshapes phase and group delay through an additional lossless AP6 excitation stage. Attacks enter the network as a dense, weightless cloud while sustained tone remains intact—without envelope pumping or granular windows.
One liquid field
Current places every delay line inside a shared two-axis flow. Delay offset, damping and full stereo position move together, so the space turns and drifts without becoming an obvious chorus.
Evolution
Evolution is not a generic modulation amount. It knows the selected character and moves the parameters that define its identity—delay distribution, diffusion, spectral span, swell, damping and stereo movement.
Move the control and watch the entire field respond.
Harmony
Harmonic Gravity listens to the dry signal, builds a confidence-weighted pitch-class map and gently excites stable resonant modes after the FDN. It does not retune the existing tail or force the signal into a guessed key.
At 0%, Harmony is an exact bypass. Uncertain or monophonic material stays deliberately subtle; Freeze holds the current map.
Focus
Focus is perceptual masking relief, not conventional full-band ducking. It finds only the wet frequency regions that obscure an active dry signal and opens temporary, cut-only pockets.
Four analysis bands, 40 ms stereo-aware detection and up to approximately 5.5 dB of presence relief. A hard-left sound does not suppress the right tail.
The essential controls
Every control is smoothed inside the DSP. No memory allocation, locking or system calls happen on the audio thread.
Linear dry/wet balance from a completely dry signal to the full Ocean field.
0–100%Broadband RT60 without decay-linked input compensation: the first Wet return stays present while longer tails naturally gain density.
0.2–30 sCompress or expand all decorrelated delay lengths, from a compact resonant room to an impossible volume.
0–200%Places silence before the input diffusion field while leaving the internal reverb structure untouched.
0–250 msShapes low-frequency energy inside the feedback loop so long tails remain deep without becoming heavy.
20–1000 HzControls high-frequency loss on every circulation through the network, not only at the output.
1–20 kHzWet-only Mid/Side control. It also opens Lateral Decay; Mono Safe adds a gentle 145 Hz Sub Anchor and a shared-sign decoder.
0–200%Fades the input away, preserves fractional-delay motion and keeps the held loop protected by an independent 3 Hz DC Guard.
Under the surface
Ocean begins with an eight-line Feedback Delay Network. Prime-scaled, decorrelated lengths feed an orthonormal matrix, so density can grow without the loop inventing energy. Character processing changes how the space develops—not whether it remains stable.
Orthonormal mixing redistributes energy, while an unchanged input injection keeps the onset present as RT60 grows.
One ultra-slow field links delay, damping and full stereo movement while runaway feedback and invalid values remain contained.
Low cut and damping shape every circulation; a separate 3 Hz guard remains active in the Freeze path.
Choose the original expansive projection or a shared-sign field with a gentle 145 Hz Sub Anchor and no disappearing FDN lines.
Built to travel
The DSP core is independent from the interface, unit-tested and prepared for the sample rates used in modern production.
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