Reverb

This effect simulates the effect of a spacious or acoustically live interior. Start by specifying the room size, and then adjust the other settings.

Mix Specifies the proportions of the original audio and the effect. Dry is the original audio.

Decay Specifies the time it takes for the effect to subside. A longer decay can simulate a larger space.

Diffusion Specifies how much the effect scatters the original audio. More diffusion can make the audio source sound as if it is distant from the microphone.

Brightness Specifies the amount of detail preserved from the original audio. More brightness can simulate a room with live, or highly reflective, acoustics.

Algorithm Specifies the room type you want to simulate, determining the overall reverb effect.

Applying Effects > Audio effects included with Premiere > Reverb