Hollow is a space reverb effect plugin from Sinevibes built on a massive feedback delay network. It is available in VST3, AU and AAX formats for Windows and macOS.
Hollow is a reverb effect built around a large delay network of 24 delay lines, 32 filters and a feedback matrix with up to 256 connections. With every setting maxed out, the developer says the tail can run past 15 minutes while keeping a natural exponential decay. A variable diffusion stage and a bi-directional pre-delay let the reverb tail come before the dry signal, opening creative options beyond standard reverbs.
Hollow adds depth through unison-style modulation from four mutually phase-shifted sine oscillators, which Sinevibes describes as a source of deep, chorus-like richness. Low-pass or high-pass damping filters shape the tail, and a dedicated stereo width formula moves the reverb from mono to full stereo.
The engine supports mono to mono, mono to stereo and stereo to stereo channel configurations, so it can be placed on single sources or stereo buses.
The pre-delay is the feature that sets Hollow apart. Because it can run in either direction, the reverb can start before the dry input, which suits reversed-style effects and unusual rhythmic textures.
Lag filters on all continuous parameters keep adjustments smooth and click-free. Every parameter has a consistent name, mapping, value and unit in both the interface and host automation, and the interface can be scaled up to 200%. Built-in preset management is included.
Formats, systems and requirements as listed by Plugin Boutique. Missing details are left out, not guessed.
| Developer | Sinevibes |
|---|---|
| Type | Plugin |
| Category | Reverb |
| Formats | VST3, AU, AAX |
| Operating systems | Windows, macOS |
| Architecture | 64-bit |
| Free trial | Yes |
Hollow is available in VST3, AU and AAX formats. It runs on Windows and macOS.
On Mac, Hollow requires macOS 10.9 or later in 64-bit form, with an Intel or M1 Apple processor, and supports AU, AAX and VST3. On Windows, it requires Windows 8.1 or later in 64-bit form and supports AAX and VST3.
Yes, Hollow offers a trial version.
Hollow's pre-delay is bi-directional, so the reverb tail can come before the dry input signal as well as after it in normal operation.
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