The cloud
Drag the nebula to sculpt — size and decay in one gesture.
Spaces that shouldn't exist.
NEBULA is an FDN reverb built as a volumetric cloud. Drag the nebula to sculpt size and decay; it breathes on its own or to your tempo, and freezes into an infinite wash.
Size
Scales the delay lines — from a short room to an endless cathedral, and far beyond.
Decay
The tail length (T60, 0.1–12 s). Push it to the max and the tail freezes — infinite, stable, still breathing.
Tone
Tilt the colour of the tail — bright and glassy, to dark and warm.
Breath / Sync
Depth of the slow breathing that modulates the space — free and organic, or locked to your host tempo (1/2 · 1 · 2 · 4 bars).
Mix
Dry/wet blend, from a hint of air to a full wash.
In / Out · In Phase
Input and output trim (±24 dB). IN PHASE folds the tail to mono-safe in one click.
A real space, modelled.
Not a sample of a room — a living network of delays, tuned like real air.
FDN (Feedback Delay Network)
Eight lossless delay lines, Householder-mixed — dense, smooth, metal-free decay.
Frequency-dependent decay
T60 per band: highs fade faster than lows, the way real air absorbs.
Early reflections
A short FIR of early reflections sets the room before the tail arrives.
Breathing modulation
A slow LFO makes the space feel alive, never static or metallic.
Lookahead limiter
True-peak lookahead on the output — the wash never clips your master.
Mono-safe
IN PHASE folds the tail to mono — wide spaces that still survive the club.
Formats: VST3 · AU
Systems: macOS · Windows
Build: Universal (Apple Silicon + Intel)
Latency: 3 ms lookahead (PDC-compensated)
License: AGPLv3 · open-source
NEBULA is free. And open.
NEBULA on its own, ready to go — the Mac installer (VST3 + AU, universal, macOS 11+) drops it straight into your plug-in folders: double-click, done. On Windows: VST3 (64-bit, 10+) as a ZIP.
Download NEBULA — Mac ↓
NEBULA — Windows ↓
Read the manual →
Technical sheet (PDF) ↓
Source on GitHub ↗
Want the whole catalog? All 7 in one installer ↓
Free and open-source (AGPLv3) · VST3 · AU · macOS universal · Windows (VST3)
First time — macOS: the installer is unsigned; if Gatekeeper blocks it, right-click → Open (macOS ≤ 14) or System Settings → Privacy & Security → "Open Anyway" (macOS 15+). Windows: unblock the ZIP before extracting, then copy the .vst3 folder to Program Files\Common Files\VST3.