It helps create a smooth and rich reverb while still maintaining clarity.

As a general guideline, lower diffusion amounts are often better for vocals. How you approach it will depend on the source that you are applying it to. Increasing and decreasing the diffusion amount can thicken your sound or create more discrete echoes. In some cases, having fewer controls can be good for a reverb plugin, as it’s easier to go too far with more. A slower diffusion build-up is often good to create some separation between the reverb and the source. Using the diffusion size knob, you can control how quickly the diffusion builds up and the space between the early reflection delays. Although simpler, Sabrina Reverb’s diffusion size and amount controls let you get quite a lot done. Some reverb plugins cover diffusion settings with more controls, maybe having shape size/attack knobs and early/late reflection diffusion knobs, like Valhalla’s Vintage Verb. It has diffusion size and amount controls, LFO amplitude, and speed controls, and a recycle control. Sabrina Reverb has a straightforward and easy-to-use GUI. See also: REVERB WARS: Blackhole v Spaced Out v Supermassive v Frostbite

Valhalla vintage reverb vocals setting