Sinevibes Hollow

Sinevibes Hollow GUI

Sinevibes has released Hollow, a vast space reverb effect plugin for Mac and Windows. The company says that it's the biggest-sounding effect they'd ever developed, and it includes several unique features such as bi-directional pre-delay stage and unison-style time modulation. Just like all its recent releases, the plugin is available in AAX, AU and VST3 formats.

At the core of Hollow is a massive delay network comprised of 24 delay lines, 32 filters, and a feedback matrix with as many as 256 connections. With all settings maxed out, this engine is capable of producing tail times that exceed 15 minutes, while still having a very natural exponential decay. Hollow includes a variable diffusion stage and a unique bi-directional pre-delay: in addition to normal operation, it can also make the reverb tail precede the dry input signal, opening interesting new creative possibilities. Additionally, the plugin has trademark unison modulation via four phase-shifted sine oscillators – for adding deep, chorus-like vibrance and richness. The complex yet highly musical algorithms in Hollow also feature finely-tuned low-pass or high-pass damping filters, and employ a very special formula for adjusting the reverb engine’s stereo width – giving it a truly vast, almost three-dimensional sound.


  • Reverb engine based on a feedback delay network with a 16x16 matrix
  • Unique two-way pre-delay stage
  • Variable diffusion stage
  • Stereo width adjustable from mono to full expansive stereo
  • Unison-style modulation via four mutually phase-shifted oscillators
  • Variable low-pass or high-pass damping filters

Hollow is immediately available for $39. It works with macOS 10.9 or later and with Windows 8.1 or later, and is provided in 64-bit AAX , AU and VST3 plugin formats.