Stereo widener & imager
Firmament
Open the heavens — a stereo widener and imager for lush orchestral layers.
AU · VST3 · Standalone · macOS & Windows · AGPL-3.0
About
A Mid/Side stereo widener and imager that gives lush orchestral layers — strings, choirs, synth pads — a wider, more open stereo image without smearing the low end: an optional multiband crossover keeps sub-bass centered regardless of how wide the rest of the spectrum is pushed.
Why the name?
The firmament is the vault of heaven — the widest thing anyone has ever looked at. As a Mid/Side widener, Firmament opens exactly that dome above your mix while the bass stays anchored to the ground.
Features
- Width — 0–200% Mid/Side width scaling; 100% is an unmodified pass-through of the input image
- Bass Mono Freq / Low Width — optional crossover (0–600 Hz) that keeps sub-bass centered while the highs go wide
- Auto Mono Safety — correlation-driven Side attenuation with a dead-zone and adjustable floor, plus an optional per-band mode (v0.2.0)
- Decorrelate — gentler mono-compatible widening alternative to Haas Mode, at a smaller mono-fold-down cost (v0.2.0)
- Haas Mode — optional 0–40 ms widening for genuinely mono material; a clearly documented trade-off, off by default
- Mono-safe by construction — the mono downmix is provably identical to the input's (Haas Mode/Decorrelate aside)
- Zero latency — TPT Linkwitz-Riley crossover, no oversampling, no lookahead anywhere
- Running correlation estimate exposed for a future GUI meter
- Output — ±24 dB trim
- Factory presets & preset management — browse/save/import/export via the in-plugin preset bar
Download
The latest builds are published on GitHub Releases.
The macOS binaries are Developer-ID-signed, notarized by Apple and stapled — they install and open without Gatekeeper warnings. Windows builds are not yet Authenticode-signed; SmartScreen may warn about an unknown publisher.
Screenshots
Coming with the next release.
The custom interface is currently in design — screenshots will appear here as soon as it ships.
Audio examples
Coming with the next release.
Before/after clips are being recorded — audio examples will appear here with an upcoming release.
Support development
Basilica Audio is free software, built at night and tuned by ear. If it earns a place in your session, you can help keep the candles lit.
Donation links are not wired up yet — they will go live soon.