Bitter Apple’s reverb plugin Propagation is available as a free download for a limited time. This article covers the download details and an overview of Propagation.
What Is Bitter Apple Propagation?
Propagation is an algorithmic reverb plugin that starts from impulse response (IR) analysis and lets you freely edit size, density, width, clarity, motion and more. The IR is treated only as a “fingerprint” of a space, so you are not tied to a single fixed convolution snapshot and can keep shaping the space inside your mix.
Key Features
- Intuitive, mix-oriented controls such as Space Size, Density, Clarity, Transient, Width and M/S Bias
- IR Morph lets you move away from a single measured space and evolve it into a new hybrid character
- Load your own IRs and use them as an editable starting point (User IR loading)
- Character selection changes the behavior of the reverb itself instead of relying on fixed presets
How to Download and Install Propagation
From the official Propagation page you can download the macOS installer (Propagation_1.5.0.pkg) or the Windows VST3 build (ZIP).

