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Reverb

Reverb toolbar item

The Reverb toolbar controls allow quick access to the Reverb settings. The blue activity indicator acts as an on/off switch for the Reverb effect.

Reverb Inspector

You can open the Reverb Inspector using the Inspector button in the Toolbar (Cmd-2).
To apply Reverb effects, check the Reverb enable checkbox.

Presets

You may save any combination of Reverb settings as a preset to be reapplied instantly later.

Global mode

When Global mode is switched on the current Reverb settings will apply for all songs.
When Global mode is switched off, as it is by default, Reverb settings will be saved along with the current track. Whenever this track is played, the saved Reverb settings will be applied.

Note that only per-track settings for Neutrino Playlist items are saved persistently across sessions. Conversely, settings for iTunes and Watched Folder items are stored until Neutrino is quit.

QuickTime playback and Reverb

When a track is played in QuickTime mode, for example a movie or a protected file (generally an m4p file purchased through the iTunes store), the Reverb controls will become inactive.

Related

More about Warp & Equalize.